The most submissive thing in the world can ride roughshod over the hardest in the world – that which is without substance entering that which has no crevices.
That is why I know the benefit of resorting to no action. The teaching that uses no words, the benefit of resorting to no action, these are beyond the understanding of all but a very few in the world.

Lao Tse, Book 2, XLIII
(Translation D.C. Lau Penguin1963)