Taoism

Tao Te King, chapter 43

The softest thing in the world dashes against and overcomes the
hardest; that which has no (substantial) existence enters where there
is no crevice. I know hereby what advantage belongs to doing nothing
(with a purpose).
There are few in the world who attain to the teaching without
words, and the advantage arising from non-action.

Source Lao-tzu, Tâo Teh King, trans. James Legge, Sacred Books of the East vol. 39 (1891), en.wikisource.org · Contents