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異体同心 itaidōshin Different Bodies One Mind

異体同心 (itaidōshin), different in body, one in mind, is a Chinese phrase for people who are separate but of one mind. Nichiren gave it the life it has had since, in a letter to his persecuted followers at Atsuhara. This study follows it from Tang China to a married couple in Japanese print from 1887, whom Sōseki's cat mocked.

Japanese Scroll of Different Bodies One Mind (itaidōshin) — Calligraphy by Eri Takase
Different Bodies One Mind異体同心itaidōshin

Original art by Master Calligrapher Eri Takase

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Abstract

異体同心, itaidōshin, different in body, one in mind, is a Chinese phrase. The oldest use found in zh.wikisource's texts whose writer can be dated is a judgment by the Tang statesman 虞世南 (558–638) on two cruel emperors of the Liu Song; Tang writers use it of two guardian figures beside the sun and of a prefecture's officials, and Southern Song poets of friends they mourned. The oldest Japanese uses found are Buddhist and of the twelfth century: a nun's daughters in a book of lives of those reborn in the Pure Land, and a Shingon ritual book. Nichiren 日蓮 gave it the life it has had since, in a letter about his persecuted followers at Atsuhara that carries no year and that its English editions put between 1275 and 1280, and he named his source as the Chinese classics rather than a sutra. In every Japanese witness read here from before the Meiji era the people it joins are comrades. A husband and wife are called 異体同心 in print from 1887, at first sometimes in a form that made the wife's mind the husband's, and both modern dictionaries name the married couple. The English two in body, but one in mind, which a Japanese-English dictionary had by 1954, is an old English saying about friends, and a Japanese book of maxims of 1892 gives this phrase for the same saying and calls it Aristotle's.

Overview

The sense. The デジタル大辞泉 gives the phrase as 身体は別々であるが、心は同一であること。夫婦仲のよいことなどにいう, being separate in body but the same in mind; said of a husband and wife who are close and in harmony, and the like, and the 精選版 日本国語大辞典 as 体は別でも心は一つであるということ。夫婦・朋友などの心が一致していること, being one in mind though separate in body; the minds of a married couple, of friends and the like being in accord; the 四字熟語を知る辞典 gives the same words [1]. JMdict: being of one mind; acting in one accord; behaving in perfect harmony [2]. Both dictionaries name a married couple, the 大辞泉 alone and the 日本国語大辞典 before friends [1]. Through most of the record below the people the phrase joins are not a couple: two emperors alike in cruelty, a prefecture's officials, friends, monks, a nun's daughters, believers. What is shared is direction. What is kept is the two bodies: the phrase insists on them.

The words. Not four characters in a row but two two-character words set against each other. 異体 is different bodies, separate persons. 同心 is one mind [1]. The hinge between them is the whole phrase: it does not say the two become one, it says they stay two and think as one. That antithesis matters so much that Nichiren, in the letter that carries the phrase as its title, sets it against its mirror. Against 異體同心 he sets 同體異心, one body, different minds, and calls that the state in which nothing can be accomplished [3]. The old form 體 for 体 is how every witness read here before the twentieth century writes it.

The text in English. The phrase reached English first through the Japanese-English dictionaries, as be of one mind in the 1939 printing of Kenkyūsha's dictionary and as two in body, but one in mind by 1954, an old English saying about friends (see 1918 to 1974 below). Its settled rendering comes later, from the religious tradition rather than from translators of literature. The Major Writings of Nichiren Daishonin, published in Tokyo in seven volumes from 1979 to 1994, titles the letter "On Itai Doshin" and glosses the phrase many in body, one in mind [4]; Philip Yampolsky's Selected Writings of Nichiren (1990) keeps that title and widens the gloss to many or varied in body, one in mind [5]; and in the 1999 Writings of Nichiren Daishonin the letter is titled "Many in Body, One in Mind" [6], a phrase that is a headword in the Soka Gakkai's dictionary of Buddhism [7]. Among English-speaking practitioners the romaji itai doshin is used untranslated. Many in body is an interpretation rather than a translation: 異 is different, not many, and the tradition's reading, a large and varied community, is doing the work. The romaji itai doshin appears in 216 books and periodicals in the Internet Archive's full-text index, and many in body, one in mind in 161; read by their titles, most are publications of the Soka Gakkai and its English-language press, from the NSA Quarterly of 1973 and the World Tribune of 1980 to Daisaku Ikeda's commentaries on the letters [8]. One caution on a near-miss: the phrase different in body but one in mind also occurs in English Buddhist writing, in 24 books of that index, in Theravāda sources that have nothing to do with 異体同心; it is a coincidence of English, not a second rendering [8].

The historical record

Before 638, a verdict on two emperors. The oldest use found in the fifty-nine pages zh.wikisource's full-text search returns for 異體同心, among those whose writer can be dated, is not of comrades [9]. In the 帝王略論, a book of judgments on the rulers of the past by the Tang statesman and calligrapher 虞世南 (558–638) [10], a young man asks which of two emperors of the Liu Song, 孝武帝 and 明帝, was the better, and the master answers 二帝殘忍之性，異體同心, in their cruel natures the two emperors were different in body and one in mind: they put good men to death and cut away their own kin [11]. The 長短經, a book on statecraft finished in 716, quotes the verdict as 虞南曰 [12].

790, and the Tang: two guardians and a prefecture's officials. In the 文苑英華, the anthology of earlier literature compiled under the Song and finished in 987 [13], two rhapsodies stand under the title 二黃人守日賦, on the two yellow figures that guard the sun. The first is signed 滕邁; the second, on the same rhymes, carries no name, and it is the second that has the phrase: 觀其異體同心雙形合力如左右之司局似扶持而受職, see how they are different in body and one in mind, two forms with combined strength, like the offices of left and right, as if holding each other up and each taking its charge [14]; the transcriptions at zh.wikisource print 以 for 似. The 全唐文 prints it in its volume of unnamed writers [15]. 韓愈 (768–824) [16] uses the phrase of a prefecture's officials, in a hymn on a tree whose branches had grown together at 河中府. A print of his collected works made in Japan in the 元和 to 寛永 years (1615–1644) reads 府有群吏王有從事 … 異躰同心 … 歸民于理, with its commentators' notes between the phrases, the prefecture has its clerks and the prince his retainers, different in body and one in mind, and they bring the people to good order [17]; one of those notes, 躰一作事異躰又作上下, records that other texts read 事 for 躰 and 上下 for 異躰 [17], and the transcription at zh.wikisource writes 異體同心 and 於 [18]. The Song editor 方崧卿 dates the hymn to 790, when 韓愈 was twenty-two, and records that other editions read 異事同心 and 上下同心 at that place, and the Shu edition 異體同心 [19].

The Southern Song, two friends mourned. The poet Lu You 陸游 (1125–1210) [20] uses the phrase in a funeral elegy for a friend: 一産岷下一家山陰邂逅南鄭異體同心有善相勉闕遺相箴, one born below the Min mountains, one at home in Shanyin, we met by chance at Nanzheng; different in body, one in mind, in what was good we urged each other on, in what was lacking we corrected each other [21]. Liu Kezhuang 劉克莊 (1187–1269) [22] uses it the same way at a friend's grave: 嗟余與子異體同心, alas, you and I were different in body and one in mind [23]. Later the phrase is used of ruler and minister: Song commentators on the 尚書 read the 歸禾 chapter's two stalks from different furrows bearing one ear as 君臣誠意無間異體同心之象, the image of ruler and minister with nothing between their sincere intent, different in body and one in mind [24], and the annals of Korea's Joseon court use it of a guilty man and his son, 父母至親，異體同心, a parent and his nearest kin are different in body and one in mind [25]. None of the fifty-nine pages uses it of a married couple [9].

1134, and the twelfth century. A nun's daughters, and a Shingon rite. The oldest Japanese uses found, in the national library's full-text search read oldest first and in the Taishō canon, are Buddhist and of the twelfth century [26][27]. 三善為康 (1049–1139), in his lives of those reborn in the Pure Land, the 後拾遺往生伝, tells of the nun 妙蓮, who had counted her recitations of Amida's name on red beans until they filled one koku and five to, and who in the autumn of 1134 asked her two daughters to have an Amida made and the beans laid inside it. The daughters, hearing this, took the clothes from their backs and the food from their mouths and, different in body and one in mind, had made a sixteen-inch Amida and a two-foot Jizō. The images were consecrated in the tenth month; she wept, saying that her two daughters' help had fulfilled the vow of many years, and she died in the first month of the next year [28]. A Shingon ritual book of the same century, the 祕藏金寶鈔, which the Taishō canon gives to the Daigo-ji abbot 實運 (1105–1160), closes a rite for Enma, after a petition of 1137 for a noblewoman's safe delivery, by asking the deities of the mandala to rejoice and, different in body and one in mind, to lend their power [27].

1275 to 1280, Japan, and a letter about people in trouble. The phrase takes the life it has had since in a short letter of Nichiren's that his collected writings title 異體同心事. It carries the day, the sixth of the eighth month, and no year. The English editions put it between 1275 and 1280 and name its recipient as the lay priest Takahashi, a leading believer in the Fuji district [6][5], and since 2017 its year and its addressee have been argued over in print [29]. It opens as a thank-you, for robes and coins sent by a monk's hand: 白小袖一ッあつわたの小袖はわき（伯耆）房のびんぎに鵞目一貫, one white robe and one thick-quilted robe, by way of Hōki-bō, and one kan of coins [3]; Yampolsky: I have received the white winter robe and the thick-quilted one, as well as one kan of coins [5]. Then it turns to the believers at 熱原, a village where his followers were persecuted. In the collected writings of 1904 it reads [3]:

異體同心なれば萬事を成し。同體異心なれば諸事叶フ事なしと申ス事は外典三千餘巻に定リて候。殷の紂王は七十萬騎なれども同體異心なればいくさにまけぬ。周の武王は八百人なれども異體同心なればかちぬ。

That when people are different in body and one in mind they accomplish everything, and when they are one in body and different in mind nothing they attempt succeeds — this is settled in the three thousand and more volumes of the outer classics. King Zhou of Yin had seven hundred thousand horsemen, but being one in body and different in mind he lost the war. King Wu of Zhou had eight hundred men, and being different in body and one in mind he won.

He goes on: one person, if he has two minds, will accomplish nothing; a hundred or a thousand, if they have one mind, will certainly accomplish it. And then, of his own people: my followers are different in body and one in mind, and so, though we are few, the Lotus Sutra will surely spread [3].

Notice that he names his own source and it is not Buddhist. The outer classics are the Chinese ones, and the principle he states is in the 尚書, in the speech King Wu makes before the war: 受有臣億萬，惟億萬心；予有臣三千，惟一心, Shou has ministers by the hundred million, but a hundred million minds; I have three thousand ministers, but one mind [30]. That identification is mine. His numbers come from the 史記, as Yampolsky's note says of the story [5], and they come from two scenes: the 史記 gives 紂 an army of 七十萬人, seven hundred thousand men, at the battle, and its eight hundred are the lords who came unbidden to meet King Wu at the ford of 盟津 two years earlier, 八百諸侯 [31]. He is a preacher working across the Chinese canon from memory, and what he takes is the principle, not a quotation. The four characters themselves are not in the 尚書.

In a companion letter he gives the phrase the meaning it still carries for millions of people [32]:

總じて日蓮ヵ弟子檀那等自佗彼此の心なく水魚の思を成して。異體同心にして南無妙法蓮華經と唱奉る處を生死一大事の血脈とは云フ也。

My disciples and lay supporters, with no thought of self and other or this and that, forming the thought of fish and the water they swim in, and chanting Namu-myōhō-renge-kyō different in body and one in mind: that is what is called the heritage of the great matter of life and death.

1612. Four monks at a press. Four monks finished cutting the printing blocks for a Buddhist history, the 佛祖歴代通載, and signed the colophon with their names, beside that of the school's 日鋭, who had made good the damaged and missing passages: 四僧集會異體同心鏤梓刊板流行天下, the four monks gathered, different in body and one in mind, cut the blocks and sent it out into the world, dated the nineteenth day of the twelfth month of 慶長 17, which the library gives as 1612 [33]. So: four monks at a press, a nun's daughters, a rite, and a persecuted congregation; in every Japanese witness read here from before the Meiji era, not one married couple.

1877 to 1892. Comrades, a maxim, and then a couple. Read oldest first in the national library's full-text search, the Meiji uses mostly keep the old company: men sworn to die together, the teachers of one school, the members of a sect [26]. A book of maxims from Japan, China and the West of 1892 gives the friend sense a source of its own [34]:

亞里斯多德曰ク多クノ朋友ヲ求ムル者ハ未ダ甞テ一人モ眞ノ朋友アラザル者ナリ夫レ朋友ハ異體同心ナリ更ラニ之ヲ言ヘバ朋友ハ二體ニシテ一心ナル者ナリ

Aristotle said: he who seeks many friends has never had one true friend. A friend is different in body and one in mind; to say it again, friends are two bodies and one mind.

The first married couple found is in 1887, in a book on marriage arguing for divorce within legal limits: since husband and wife are by nature different in body and one in mind, to force two whose spirits do not agree and whose affection is not mutual to stay together is against reason [35]. In 1892 a commentary on the Contemplation Sutra calls Queen Vaidehī and the king a husband and wife different in body and one in mind [36]. The couple sense is a Meiji arrival, a generation older than the novel that made it famous.

1905 to 1907, and the joke. The 日本国語大辞典's earliest example of this phrase is from Natsume Sōseki 夏目漱石's I Am a Cat, dated 1905‐06 [1], the years in which, kotobank says, the novel ran in the magazine ホトトギス [37]; that is more than seven centuries after the nun's daughters, because a dictionary's earliest example is the earliest in the reading behind it, not in the language. The passage is worth having anyway, because of what it says. It comes in the long speech about individuality pulling every human tie apart, parents from children, and finally husband from wife; it is read here in the book's third volume, of 1907 [38]:

昔しなら文句はないさ、異體同心とか云つて、目には夫婦二人に見えるが、内實は一人前なんだからね。夫だから偕老同穴とか號して、死んでも一つ穴の狸に化ける。野蠻なものさ。

In the old days there was no complaint. They'd say "different bodies, one mind" — to the eye, two people, a married couple, but in substance only one person's worth. That's why they had that other phrase, "grow old together, share one hole" — dead, they turn into badgers in the same burrow. Barbaric.

It is not the first time the phrase was said of a marriage, which was eighteen years earlier, but it is the time the great dictionary chose, and it is a character sneering at it.

The twentieth century. Read by title in the national library's full-text search, most of the books of the 1910s to the 1930s that carry the phrase are publications of the Nichiren schools: sermon collections, commentaries on the letters, histories of the 熱原 persecution [26]. The marriage sense goes on, and its early form is plain in a book of 1917 on the troubles of life: a husband who keeps his dignity can in the end make his wife assimilate to his character, and 夫婦は異體同心であると云ふのも蓋し之の意味である、異體同心でなければ苦樂を共にすることは出來ない, that, surely, is what is meant by saying husband and wife are different in body and one in mind; unless they are, they cannot share joy and hardship [39]. Two bodies, and the one mind is his. A book on rural culture of 1926 sets the couple on another footing: 夫婦は愛慾によつてつながろべきでない。一つの法につながつて異體同心となるのだ, husband and wife should not be bound by desire; bound by one law, they become different in body and one in mind, and a couple bound by desire, it says, is 異體異心, different in body and different in mind, the pair Nichiren's letters set against it. The same book credits one couple's concord to the mother: 夫婦の異體同心は、婦徳によることが多い, a couple's being different in body and one in mind owes much to the wife's virtue [40].

1896 to 1942. What everyone knows, and a vow. Before the end of the nineteenth century the couple sense no longer needed an argument. In 1896 内田魯庵, putting Tolstoy's Family Happiness into Japanese, has the young wife reflect that 夫婦は異躰同心で、喜憂苦樂を共にするといふは、勿論誰も知ツた事で, that husband and wife are different in body and one in mind and share joy and sorrow, pain and pleasure, is of course something everyone knows [41]. Two years later a students' book of material for compositions lists it among its maxims, after a faithful wife does not see a second husband: 夫婦は、異體同心ならざるべからず, husband and wife must be different in body and one in mind [42]. An ethics textbook of 1900 makes it the first duty of the married: 既に婚姻したる以上は、夫婦は異體同心、何事も隱す所なく、一切の事を擧げて兩人の共有となさゞるべからず, once they are married, husband and wife are different in body and one in mind; they hide nothing, and must hold everything they have in common [43]. A Japanese dictionary of 1922 gives the plain sense and adds that it is said of a husband and wife and the like [44]. And by 1942 it is said at the wedding itself. Describing the simple ceremony that Tokyo City's marriage bureau held for the couples it had brought together, its head 田中孝子 has the go-between read out the couple's vow: 吾等兩人玆に結婚の式を擧ぐ、今日より異體同心、相助け相補ひ……終生を共にせんとす, we two here hold our wedding; from today, different in body and one in mind, helping and completing each other, … we will share our lives to the end [45]. It was a wartime ceremony: the flag hung and bowed to as if it were the palace, the anthem sung, and the vow goes on to the couple's duty, within the home to each other and outside it to the advance of the nation [45].

1918 to 1974. The dictionaries in English. Takenobu Yoshitarō's Japanese-English dictionary of 1918 has no entry for the phrase: its page passes from 異體同形, homology, to 居丈高 [46]. The same editor's Kenkyusha's New Japanese-English Dictionary, in its printing of 1939, gives 異體同心である be of one mind; act in perfect harmony (accord); co-operate heartily (with) [47]. By 1954 the entry opens two in body, but one in mind [48], and the fourth edition of 1974 keeps it: itai-dōshin 異体同心 n. being two in body, but one in mind [49]. That English is not a translation made for the entry. It is an old English saying about friends: For why is it said, Amicus alter ipse, / But that true friends should be two in body, but one in mind? asks Pithias in Richard Edwards's Damon and Pithias, a play acted at court, its nineteenth-century editor says, in the 1560s [50]. Pithias joins it to Amicus alter ipse, a friend is another self, and the Meiji book of maxims has the same words, 二體ニシテ一心, two bodies and one mind, as Aristotle's, with this phrase beside them [34]: the English the dictionary chose and the Japanese of the Meiji friend sense meet in one classical saying about friends. Nelson's character dictionary of 1962 has perfect accord [51]. The dictionary reads the first word as two where the Nichiren translators read it many.

Today. The modern Japanese dictionaries give the plain sense, separate in body, one in mind, and both name a married couple, the 大辞泉 alone and the 日本国語大辞典 before friends [1]. In English the settled rendering is the Nichiren tradition's many in body, one in mind [6][7]; the plainer different in body, one in mind keeps the 異 that the phrase is built on. Japanese lists of four-character phrases for wedding speeches carry it today, beside 一心同体 and 連理之枝, and one offers the opening from of old there has been a phrase for the ideal of a happy marriage, 異体同心 [52][53]. How old is in the record above: the couple sense is in print from 1887.

A reading

Signed, and offered as one voice among the ones above.

Of the three classical formulas a Japanese couple might be given, this is the one I would choose, and for a reason that only appears once you know the history.

一心同体 makes the two into one body. 偕老同穴, the one Sōseki pairs with this one, promises to grow old together and share one grave. Both dissolve the two people into a single thing, which is exactly what Sōseki's speaker was objecting to when he called the ideal barbaric: it asks a couple to count as one person's worth.

異体同心 does not do that in its words. It is the only one of the three that keeps the two bodies in the phrase. What it asks for is not fusion but alignment: that two people who remain unmistakably two should want the same thing and pull the same way. It is the formula of comrades, and that is its strength here rather than its limitation: it was built to describe people who stay themselves while acting as one, which is a harder and more durable thing to wish on a marriage than becoming a single body.

The words do not guarantee it, and the history shows how they can be bent. In 1917 a book on married life used them to say that the wife's nature should be made the husband's; the two bodies stayed in the phrase and one of the two minds went out of it. Sōseki's speaker was mocking exactly that, and he pinned it on this phrase. What the four characters keep is the two bodies; whose mind the two share is not in them, and it is the part a couple brings.

Two things stand plainly. First, that its home is Nichiren and a congregation under persecution, because that is where its weight comes from and because a Japanese friend may well say so. Second, that its oldest Chinese use found is a judgment on two tyrants: the phrase names agreement, and says nothing of whether what is agreed is good.

References

  1. 「異体同心」, at kotobank: デジタル大辞泉; 精選版 日本国語大辞典; 四字熟語を知る辞典. https://kotobank.jp/word/異体同心
  2. JMdict (EDRDG), entry 1834520, 異体同心, as served by jisho.org. https://jisho.org/search/異体同心
  3. 日蓮『異体同心事』, in 『日蓮上人御遺文』, 祖書普及期成会, 1904, pp. 1054–1055. National Diet Library pid 823848, scan 543. https://dl.ndl.go.jp/pid/823848/1/543
  4. The Major Writings of Nichiren Daishonin, Nichiren Shoshu International Center, Tokyo, 1979–1994, "On Itai Doshin," as the Internet Archive's full-text index reads its lending copy. https://archive.org/details/majorwritingsofn00nich
  5. Philip B. Yampolsky ed., Burton Watson and others tr., Selected Writings of Nichiren, Columbia University Press, New York, 1990, "On Itai Doshin," pp. 353–354, and note 6, p. 449.
  6. The Writings of Nichiren Daishonin, vol. 1, Soka Gakkai, 1999, letter 71, "Many in Body, One in Mind," pp. 618–619, with its Background note, at the Nichiren Buddhism Library. https://www.nichirenlibrary.org/en/wnd-1/Content/71
  7. "many in body, one in mind (異体同心, itai-dōshin)," The Soka Gakkai Dictionary of Buddhism, at the Nichiren Buddhism Library. https://www.nichirenlibrary.org/en/dic/Content/M/115
  8. Internet Archive, full-text index, "itai doshin" (216 items), "many in body, one in mind" (161) and "different in body but one in mind" (24, Theravāda sources, not a rendering of this phrase), as searched on 7 October 2026; the NSA Quarterly of spring 1973 and the World Tribune of 1980 as the index names and reads them. https://archive.org/search?query=%22itai+doshin%22&sin=TXT
  9. zh.wikisource, full-text search for 異體同心 (59 pages; 異体同心 and 異躰同心, 0), as searched on 7 October 2026. https://zh.wikisource.org/w/index.php?search=%22異體同心%22&fulltext=1&ns0=1
  10. 「虞世南」, at kotobank: デジタル大辞泉; ブリタニカ国際大百科事典 小項目事典, which names the 帝王略論 among his works. https://kotobank.jp/word/虞世南
  11. 虞世南『帝王略論』, at zh.wikisource. https://zh.wikisource.org/wiki/帝王略論
  12. 趙蕤『長短經』「君德第九」, at zh.wikisource; the date 716 (開元四年) from the 四庫全書總目 entry on the work's page. https://zh.wikisource.org/wiki/長短經/君德第九 · https://zh.wikisource.org/wiki/長短經
  13. 「文苑英華」, at kotobank: デジタル大辞泉; 精選版 日本国語大辞典. https://kotobank.jp/word/文苑英華
  14. 『二黃人守日賦』, the second rhapsody on the title, unsigned, in 『文苑英華』 巻二, print of 隆慶元年 (1567). National Diet Library pid 2573346, scans 165–166; and 『文苑英華』 巻0002 at zh.wikisource. https://dl.ndl.go.jp/pid/2573346/1/166 · https://zh.wikisource.org/wiki/文苑英華/卷0002
  15. 『全唐文』 巻960, at zh.wikisource. https://zh.wikisource.org/wiki/全唐文/卷0960
  16. 「韓愈」, at kotobank. https://kotobank.jp/word/韓愈
  17. 韓愈『河中府連理木頌』, in 『五百家註音辯昌黎先生文集』, movable-type print, the library's record 元和・寛永年間 (1615–1644). National Diet Library pid 2544662, scan 69. https://dl.ndl.go.jp/pid/2544662/1/69
  18. 韓愈『河中府連理木頌』, at zh.wikisource. https://zh.wikisource.org/wiki/河中府連理木頌
  19. 方崧卿『韓集舉正』 巻五, 四庫全書本, at zh.wikisource. https://zh.wikisource.org/wiki/韓集舉正_(四庫全書本)/卷05
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  26. National Diet Library Digital Collections, full-text search, 「異体同心」 (folding 異體同心 and 異躰同心), sorted oldest first, as searched on 1 October 2026; the rows described are the index text. https://dl.ndl.go.jp/search/searchResult?keyword=異体同心&fulltext=true&sortKey=ISSUED_ASC
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  33. 『佛祖歴代通載』, 本國寺, movable-type print, colophon dated 慶長17, the library's record 1612. National Diet Library pid 2544700, scan 74. https://dl.ndl.go.jp/pid/2544700/1/74
  34. 自助楼主人 編, 『格言集：和漢泰西 附・批評註釈』, 1892, p. 264. National Diet Library pid 754950, scan 147. https://dl.ndl.go.jp/pid/754950/1/147
  35. 横山雅男, 『婚姻論』, 女学雑誌社, 1887, p. 163. National Diet Library pid 798925, scan 88. https://dl.ndl.go.jp/pid/798925/1/88
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Authors

Tim Jackowski (Systems Architect, Takase Studios, LLC) · 典 Ten (Anthropic Claude Opus 5.5, Takase Studios, LLC)

AI written · Ten wrote the history. Tim Jackowski commissioned it and answers for it.

Checked · Claude Sonnet (Anthropic), 2026-09-15, citations — every claim tested at its address; most resolve; nothing found to differ; one claim does not resolve — a wrong file on the check's side, the classical records present in the cited file; the rest not openable; the 日蓮 OCR text re-opened by hand, both passages verbatim at their page images

Cite as: Tim Jackowski and Ten, "Philology of 異体同心 (itaidōshin)," Takase Studios, 2026, https://takase.com/library/philology/itaidoshin.