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殺人剣 satsujinken Life Taking Sword

殺人剣 (satsujinken), the sword that kills, is the first half of the Zen saying 殺人刀活人剣, which the old books mostly write with 刀, the single-edged blade, in place of 剣.

Japanese Scroll of Life Taking Sword (satsujinken) — Calligraphy by Eri Takase
Life Taking Sword (satsujinken)

Life Taking Sword (satsujinken) on a traditional Japanese Scroll by Master Eri Takase.

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Abstract

殺人剣, satsujinken, the sword that kills, is the first half of a seven-character Zen saying, 殺人刀活人剣, the sword that kills, the sword that gives life. The pair is already a proverb among Chan masters in the 景徳伝灯録 of 1004, and the 碧巌録 of 1125 called it the rule of high antiquity. The saying usually writes this half 殺人刀, with 刀, the single-edged blade: so the canon in most texts, the Japanese warriors of the sixteenth century, and Yagyū Munenori 柳生宗矩, who in 1632 made it the name of one of the two books of his 兵法家伝書. The form with 剣, 殺人剣, is the rarer one in the old books and the headword of the modern dictionaries.

Overview

The text. 殺人剣, three characters: 殺, to kill; 人, a person; 剣, the double-edged straight sword of the Chinese books and the word Japanese uses for the sword as an art. 殺人 is 人を殺すこと, killing a person [1]. The saying's own word for this half is mostly 殺人刀, with 刀, the single-edged blade a warrior wore. The CBETA search finds 殺人刀 in 382 texts of the Chinese canon and 殺人劍 in 19, and in five of those the blades are exchanged across the whole saying, 殺人劍活人刀 [2]. The modern dictionaries head both: デジタル大辞泉 gives 殺人剣 satsujinken, 人を殺すために使う剣, a sword used to kill people, and sends the reader to 殺人刀 setsunintō; the 日本国語大辞典 does the same [3][4].

The sense. Inside the pair the killing half has been read three ways. In the Zen books it is what a teacher takes away: the 1915 Zen dictionary says 殺は消極、掃蕩、把住の意, killing is the negative: sweeping away, holding fast [5]. In Yagyū's book it is the sword that brings a disordered world to order, and so becomes the sword that gives life [6]. In the sword schools it is technical: Karl Friday glosses 殺人刀 swordsmanship that transfixes, or swordsmanship that kills response [7], and the Yagyū tradition, in Hiroaki Sato's English, calls the sword held in an attacking stance the death-dealing blade [8]. Minoru Kiyota names a fourth as the popular one, in a sentence that begins Popularly, katsujin-ken and satsujin-ken are interpreted as the employment of the sword for worthy … [9].

The words. Read as a Japanese word 殺人剣 is satsujinken; the Zen pair and Yagyū's book read the killing half setsunintō, in the Go-on the sutras keep, and the 日本国語大辞典 heads the seven characters せつにんとうかつにんけん [10][11]. Both readings are in the dictionaries.

The text in English. The Clearys' 1977 Blue Cliff Record has the sword that kills people and, at the fifteenth case, the single-edged sword that kills people; Sato's 兵法家伝書 of 1985 calls the book The Death-Dealing Blade; Thomas Cleary's of 2005, The Killing Sword. JMdict gives life-taking sword; sword used to kill [12][8][13][14].

The historical record

1004. The 景徳伝灯録, the record of the Chan lineages. The pair is already a proverb among the masters of the ninth century as the record remembers them. 夾山 says of 石霜, 石霜雖有殺人刀。且無活人劍, Shishuang has the sword that kills, but not yet the sword that gives life; a monk asks 清平 what is the sword that gives life? and is told do you understand?, asks what is the sword that kills? and is shouted at. The two swords are two things a teacher does [15].

Before 1052. Setchō Jūken 雪竇重顕 (Xuedou Chongxian), whose hundred cases became the Blue Cliff Record. 殺人刀，活人劍，具眼底辯取, the sword that kills, the sword that gives life: let those with eyes tell them apart [16].

1125. Engo Kokugon 圜悟克勤 (Yuanwu Keqin, 1063–1135), the 碧巌録. The book that fixed the phrase. Two cases open with it, in the sentence the Japanese dictionaries quote: 殺人刀活人劍。乃上古之風規。亦今時之樞要。若論殺也。不傷一毫。若論活也。喪身失命, the sword that kills, the sword that gives life: the rule of high antiquity and the pivot of the present day. Speaking of killing, not a hair is harmed; speaking of giving life, body and life are lost. In the thirty-first case a monk circles two masters' seats shaking his staff, and one says yes, yes, the other no, no, and both add 殺人刀活人劍。須是本分宗師, the sword that kills and the sword that gives life: for that you must be a master in your own right. Engo's marginal comments reach for it three times more [17].

The Song to the Qing. The blade exchanged. The Song monk 惠洪's 禪林僧寶傳 already writes the killing half with 劍: of the founder of the Han it says 漢高無殺人劍, Gaozu of Han had no sword that kills [18]. Later records exchange the blades across the whole saying: a Yuan master's 佛國禪師語錄 has 殺人須是殺人劍，活人須是活人刀, to kill, it must be the sword that kills; to give life, it must be the blade that gives life [19], and a Qing anthology quotes 可惜馬師有殺人劍，無活人刀, a pity that Master Ma had the sword that kills and not the blade that gives life [20]. Against the 382 texts that write 殺人刀, these are a minority [2]. Wanshi Shōgaku 宏智正覚 (Hongzhi Zhengjue) keeps 刀 and reverses the halves in verse, 活人劍殺人刀; Mittan Kanketsu 密庵咸傑 (Mi'an Xianjie) has a master 秉殺人刀活人劍, wielding the two [21][22].

1228. Mumon Ekai 無門慧開 (Wumen Huikai), the 無門関. The eleventh case, Jōshū Jūshin 趙州従諗 (Zhaozhou Congshen) testing two hermits, closes with a verse of four three-character lines: 眼流星 機掣電 殺人刀 活人劍, eye a shooting star, working a lightning flash, the sword that kills, the sword that gives life [23].

The fifteenth century. Tōyō Eichō 東陽英朝's 禅林句集. The Japanese anthology of Zen phrases lists 殺人刀活人劔 among the six-character sayings, with its two addresses, 碧岩垂示第十二 and 無門十一則, and gives the pair as a couplet of two figures, 文殊提起殺人刀 淨名抽出活人劍, Monju holds up the sword that kills; Jōmyō, that is Vimalakīrti, draws the sword that gives life [24]. A Taishō edition with Japanese readings prints the same couplet [25].

Late Muromachi. The ballad 満仲. The dictionary's first Japanese citation of the pair is a 幸若 ballad: 殺人刀活人剣、みな一念のうちなり, the sword that kills, the sword that gives life, all within one thought [10].

1558. Takeda Nobushige 武田信繁's ninety-nine articles. The oldest dated warrior's use is a house rule, and it writes 刀. Among the ninety-nine articles Shingen's brother wrote for his son, dated by their colophon to the first year of Eiroku and transmitted in the 甲陽軍鑑, the article that a samurai must never be without his sword, even lying with his wife, is glossed with the Zen line: 縱ヒ雖在夫婦一所、聊タ不可忘刀ヲ事 云 殺人刀活人劔 [26][27].

1580 to 1592. The 別所長治記. A captain shouts it as he charges, again with 刀: 小八郎聞モアヘス殺人刀活人劔ト云拾無是非掛イリ給フ, Kohachirō, hearing him out no further, cried "the sword that kills, the sword that gives life!" and charged in [28].

1603. The Jesuits' dictionary. The 日本国語大辞典, defining 殺人刀 as 人を殺すための刀, a blade for killing people, cites it from the 日葡辞書, the Jesuits' Japanese-Portuguese dictionary of 1603–04 [4].

1632. Yagyū Munenori 柳生宗矩, the 兵法家伝書. The shōgun's sword-master made the two halves the names of the two books of his family's text, and in the colophon dated the ninth month of 1632 said why: 此卷上下を殺人刀活人劔と名たる心は、人をころす刀、却て人をいかすつるぎ也、とは夫亂たる世には、故なき者多く死するなり、亂たる世を治める爲に殺人刀を用ひ、巳に治る時は殺人刀を卽て活人劔ならずや、是を以所名付也, the meaning of naming these two books "the sword that kills" and "the sword that gives life" is that the sword that kills people is, on the contrary, the sword that gives them life. In a world in disorder many die for no cause; to bring order to a disordered world the killing sword is used, and once order is made, is not the killing sword then the sword that gives life? That is why they are so named. The preface had already argued it from the Chinese maxim that weapons are instruments of ill omen: 一人の惡に依て萬人苦む事あり、しかるに一人の惡をころして、万人をいかす是等誠に人をころす刀は、人をいかすつるぎなるべきにや, because of one man's evil ten thousand suffer; to kill that one evil man and give life to ten thousand: is not the sword that kills people truly the sword that gives them life? And the body: 兵法は人をきるとばかりおもふはひが事也、人をきるにはあらず、惡をころす也, to think the art of the sword is only cutting people down is a mistake; it does not cut people, it kills evil [6]. The 日本大百科全書 reads the book's two titles 殺人刀 setsunintō and 活人剱 katsuninken [11].

Before 1840. A story told of Tsukahara Bokuden 塚原卜伝. Of the swordsman Tsukahara Bokuden (1489–1571) the 日本大百科全書 says that his life is known mostly from hearsay [29]. The Mito scholar 小宮山楓軒 (Komiyama Fūken, 1764–1840), in his manuscript 垂統大記, retells, citing the 武芸小伝, how Bokuden, on a ferry, met a swordsman who boasted that he had no equal. Asked his method, Bokuden said winning without hands; asked what, then, his two swords were for, he said they were for cutting away evil thoughts; and when the man demanded a bout, he said 慎獨則活人劍，對虐則殺人劍, watchful over myself, the sword that gives life; against violence, the sword that kills. The man jumped ashore on an island to fight him, and Bokuden pushed the boat off with the pole and left him there [30][31]. The Ministry of Education's history of education printed the passage in 1892 under 刀術, marked as taken from the 垂統大記 [32]. In that story the killing half is written with 劍, as 殺人剣 is.

1830. 安西於菟, on a tea-room scroll. A connoisseur of calligraphy tells of visiting a house where a one-line scroll hung in the tea room reading 人刀活人劔, five characters, mounted in brocade with a certificate from an old-calligraphy appraiser, and the host said 武士は人を活す為に帯刀するとはよき悟りなり, that a samurai wears his sword to give people life is a fine insight. The author saw what had happened: a monk had brushed the seven characters, and a dealer had cut off the 殺, because tea people abhor the word for killing, 殺人刀活人剣の妙語を損壊したる大ひなる罪なるべし, a great crime, to have wrecked the marvelous phrase [33].

1915. Yamada Kōdō 山田孝道's 禅宗辞典. The Zen dictionary heads the pair セツニンタウ クワツニンケン, 殺人刀活人劒: 師家の學人を接する自由の妙用を刀劍を假りて示す。殺は消極、掃蕩、把住の意。活は積極、扶起、放行の意, the master's free working in receiving a student, figured as a sword: killing is the negative, sweeping away, holding fast; giving life the positive, raising up, letting go, with the 碧巌録's twelfth case quoted; and elsewhere the pair as the first two of the seven things a Rinzai monk carries on him [5].

The dictionaries today. The 日本国語大辞典: 殺人剣, 人を殺すことを目的として用いる剣。殺人刀, a sword used with the aim of killing; 殺人刀; and the seven characters together, 禅で、妄情を断ち切る禅者のはたらきを刀剣にたとえていう, in Zen, the working of the Zen man who cuts off deluded feeling, figured as a sword [3][10].

What is not a source. Takuan Sōhō 沢庵宗彭's 不動智神妙録, which the encyclopedias set beside Yagyū's book, does not use either word; the two names are Yagyū's own borrowing from the 碧巌録 and the 無門関. The kendo and aikido books that carry the pair are reception, not sources.

The half in English

1977. Thomas and J. C. Cleary, The Blue Cliff Record, Shambhala. The sword that kills people, the sword that brings people to life: this is the standard way of high antiquity, and at the fifteenth case the single-edged sword that kills people, the double-edged sword that brings people to life, which reads 刀 and 劍 as two kinds of blade [12].

1985. Hiroaki Sato, The Sword and the Mind, Overlook Press (Barnes & Noble printing, 2004). The book is The Death-Dealing Blade, read setsuninto; Muneyoshi's definition: In our school the sword that is positioned for attack is called the death-dealing blade, and the sword that is not, the life-giving sword; and Yagyū's explanation: A blade that kills people is in truth a sword that allows them to live [8].

1991. Stanley A. Pranin, The Aiki News Encyclopedia of Aikido, Aiki News, p. 97. SATSUJINKEN. Killing sword. See KATSUJINKEN. [34]

1997. Karl F. Friday, Legacies of the Sword, University of Hawai'i Press. setsunin-to, swordsmanship that transfixes, or swordsmanship that kills response; and the two terms derive from Buddhist allegory [7].

2002. Minoru Kiyota, The Shambhala Guide to Kendo. the "death-rendering sword" (satsujin-ken), and Popularly, katsujin-ken and satsujin-ken are interpreted as the employment of the sword for worthy … [9].

2003. Victor Sōgen Hori, Zen Sand, University of Hawai'i Press. Entry 6.147, Setsunintō katsuninken. The blade that kills, the "sword" that brings to life, and the couplet as 14.675, Manjusri holds aloft the "sword" that slays people [35].

2003 and 2004. William Scott Wilson, The Life-Giving Sword, Kodansha International, and The Lone Samurai. The Shambhala printing of 2012 prints the kanji: every time the sword is in stance, it is called the Death-Dealing Sword, with satsuninto 殺人刀 in the translator's bracket; the biography, the "death-dealing sword" and the "life-giving sword" [36].

2005. Thomas Cleary, Soul of the Samurai, Tuttle. Book 1 is The Killing Sword; and "The sword that kills is the sword that gives life" is a Zen expression. In Zen literature it is never employed as Yagyu uses it here, to refer to actual killing [13].

2006. William Scott Wilson (tr.), The Demon's Sermon on the Martial Arts, Shambhala. if the sword is held in a stance, it is called the Death-dealing sword, or sat-sujin-to [37].

Today. JMdict: 殺人剣, life-taking sword; sword used to kill; 殺人刀, (killing) sword; blade; steel [14]. Of the English books above, Pranin and Kiyota romanize the modern word, satsujinken; Sato, Friday, Hori and Wilson give the saying's 殺人刀. Killing sword, death-dealing and death-rendering are the translators' words; life-taking is JMdict's. A rendering of the half keeps it a half: 殺人剣 is answered by 活人剣.

A reading

The killing half is the harder one to read alone, and the saying is what gives it its meaning: what a Zen teacher takes from a student, the sword Yagyū says ends disorder, the first stroke of the sword schools. None of the old readings is a sword for its own sake. On the form, the tradition's usual word is 殺人刀, and 殺人剣 is neither a mistake nor new: the canon has it in a minority of texts, the Bokuden story tells it with 劍, and the dictionaries made it the headword. The phrase's force is in the pair; this half is the question the other answers.

References

  1. 「殺人」, デジタル大辞泉・精選版日本国語大辞典, at kotobank. https://kotobank.jp/word/殺人-511093
  2. CBETA full-text search, searched again 26 September 2026: 殺人刀活人劍 in 128 texts, 殺人刀 in 382, 活人劍 in 241, 殺人劍 in 19, 殺人劍活人刀 in 5. https://cbdata.dila.edu.tw/stable/search?q=殺人刀活人劍
  3. 「殺人剣」, デジタル大辞泉・精選版日本国語大辞典, at kotobank. https://kotobank.jp/word/殺人剣-511096
  4. 「殺人刀」, デジタル大辞泉・精選版日本国語大辞典, at kotobank. https://kotobank.jp/word/殺人刀-548440
  5. 山田孝道, 『禅宗辞典』, 光融館, 1915. National Diet Library pid 936741, scans 253, 306 and 431. https://dl.ndl.go.jp/pid/936741/1/431
  6. 柳生宗矩, 『兵法家伝書』, in 福井久蔵 編, 『秘籍大名文庫』, 第2, 厚生閣, 1937. National Diet Library pid 1074542, scans 4, 10, 11 and 39. https://dl.ndl.go.jp/pid/1074542/1/39
  7. Karl F. Friday, Legacies of the Sword, University of Hawai'i Press, 1997. Internet Archive legaciesofswordk0000frid. https://archive.org/details/legaciesofswordk0000frid
  8. Hiroaki Sato (tr.), The Sword and the Mind, Overlook Press, 1985; Barnes & Noble printing, New York, 2004, p. 50 and the second and third books. Also Internet Archive swordmindclassic0000yagy. https://archive.org/details/swordmindclassic0000yagy
  9. Minoru Kiyota, The Shambhala Guide to Kendo, 2002. Internet Archive shambhalaguideto00mino. https://archive.org/details/shambhalaguideto00mino
  10. 「殺人刀活人剣」, デジタル大辞泉・精選版日本国語大辞典, at kotobank. https://kotobank.jp/word/殺人刀活人剣-548441
  11. 「兵法家伝書」, 日本大百科全書 (ニッポニカ), 渡邉一郎, at kotobank. https://kotobank.jp/word/兵法家伝書-1589673
  12. Thomas and J. C. Cleary, The Blue Cliff Record, Shambhala, Boulder, 1977. Internet Archive bluecliffrecord10000yuan. https://archive.org/details/bluecliffrecord10000yuan
  13. Thomas Cleary, Soul of the Samurai, Tuttle, 2005. Internet Archive soulofsamurai0000unse. https://archive.org/details/soulofsamurai0000unse
  14. JMdict (EDRDG), entries 2773360 (殺人剣) and 2777220 (殺人刀), at jisho. https://jisho.org/search/殺人剣
  15. 『景徳伝灯録』. CBETA T51n2076, juan 16 and juan 23. https://cbdata.dila.edu.tw/stable/juans?work=T51n2076&juan=16
  16. 雪竇重顕, 『明覚禅師語録』. CBETA T47n1996, juan 3. https://cbdata.dila.edu.tw/stable/juans?work=T47n1996&juan=3
  17. 圜悟克勤, 『碧巌録』. CBETA T48n2003, juans 2, 4 and 6. https://cbdata.dila.edu.tw/stable/juans?work=T48n2003&juan=2
  18. 惠洪, 『禪林僧寶傳』. CBETA X1560, juan 22, column 0535b21. https://cbdata.dila.edu.tw/stable/juans?work=X1560&juan=22
  19. 『佛國禪師語錄』. CBETA D8948, juan 1, column 0008b03. https://cbdata.dila.edu.tw/stable/juans?work=D8948&juan=1
  20. 淨符 編, 『宗門拈古彙集』. CBETA X1296, juan 12, column 0071a09. https://cbdata.dila.edu.tw/stable/juans?work=X1296&juan=12
  21. 宏智正覚, 『宏智禅師広録』. CBETA T48n2001, juans 2 and 3. https://cbdata.dila.edu.tw/stable/juans?work=T48n2001&juan=2
  22. 密庵咸傑, 『密庵和尚語録』. CBETA T47n1999, juan 1. https://cbdata.dila.edu.tw/stable/juans?work=T47n1999&juan=1
  23. 無門慧開, 『無門関』. CBETA T48n2005, juan 1. https://cbdata.dila.edu.tw/stable/juans?work=T48n2005&juan=1
  24. 東陽英朝, 『禅林句集』, 1889 typeset. National Diet Library pid 899716, scans 4 and 44. https://dl.ndl.go.jp/pid/899716/1/4
  25. 山本峻岳 編, 『禅林句集和訓略解』, 光融館, 1925, p. 142.
  26. 武田信繁, ninety-nine articles, in 『甲陽軍鑑』, 温故堂, 1893. National Diet Library pid 899828, scan 14. https://dl.ndl.go.jp/pid/899828/1/14
  27. The same articles, an Edo manuscript of the 甲陽軍鑑. National Diet Library pid 1287447, scan 52. https://dl.ndl.go.jp/pid/1287447/1/52
  28. 塙保己一 編, 『武家名目抄』, in 『故実叢書』, 吉川弘文館, 1906, quoting 『別所長治記』 and 『室町殿物語』. National Diet Library pid 772001, scans 30, 55 and 56. https://dl.ndl.go.jp/pid/772001/1/56
  29. 「塚原卜伝」, デジタル大辞泉・精選版日本国語大辞典・日本大百科全書 (ニッポニカ), at kotobank. https://kotobank.jp/word/塚原卜伝-99062
  30. 小宮山楓軒, 『垂統大記』, manuscript, volume 37, scan 39. National Diet Library pid 2560356. https://dl.ndl.go.jp/pid/2560356/1/39
  31. 「小宮山楓軒」, デジタル大辞泉・精選版日本国語大辞典, at kotobank. https://kotobank.jp/word/小宮山楓軒-504598
  32. 文部省 編, 『日本教育史資料』 〔9〕, 文部省, 1892, scan 272, under 刀術 (垂統大記抄). National Diet Library pid 809562. https://dl.ndl.go.jp/pid/809562/1/272
  33. 安西於菟, 『近世名家書画談』, 二編, 1830. National Diet Library pid 2564850, scan 22. https://dl.ndl.go.jp/pid/2564850/1/22
  34. Stanley A. Pranin, The Aiki News Encyclopedia of Aikido, Aiki News, 1991, pp. 61 and 97.
  35. Victor Sōgen Hori, Zen Sand: The Book of Capping Phrases for Koan Practice, University of Hawai'i Press, Honolulu, 2003, entry 6.147 at p. 241 and entry 14.675 at p. 586.
  36. William Scott Wilson (tr.), The Life-Giving Sword, Kodansha International, 2003 (Shambhala printing, Boston, 2012, p. 145 note 1), and The Lone Samurai, Kodansha International, 2004. Internet Archive lonesamurailifeo0000wils. https://archive.org/details/lonesamurailifeo0000wils
  37. William Scott Wilson (tr.), The Demon's Sermon on the Martial Arts, Shambhala, Boston, 2006, p. 150 note 1.

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Authors

Tim Jackowski (Systems Architect, Takase Studios, LLC) · 典 Ten (Anthropic Claude Fable 5.1 and 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, on the grouped file — every claim tested at its address; about half resolve; one resolves but differs — an unmarked reading (婦/掃), since marked; the rest not openable; one page image re-opened by hand, verbatim