塵も積もれば山となる is about many small things, kept up, adding up to something great. A grain of dust is too small to notice, and enough of them make a mountain. The proverb counts on number, not on growth: the piling is the act, and it takes time. The small things have been learning, good deeds and coins, and the proverb leaves them to you. Whether it is for a long project, a savings jar or a daily practice is yours.
Fine dust piled into a mountain is an image of a Buddhist commentary put into Chinese in the early fifth century, and Bai Juyi's couplet of about 810, 千里始足下、高山起微塵, brought it into Japanese through Tsurayuki's preface to the Kokinshū in 905. A Noh play of about 1430 already puns on the saying, and in 1627 a tract on getting rich prints it as advice about money.
We want you to be as happy with the meaning as you are with Master Takase's art. To learn more, visit Philology of 塵も積もれば山となる.