Tao Te Ching 33

He who knows other men is discerning;

he who knows himself is intelligent.

He who overcomes others is strong;

he who overcomes himself is mighty.

He who is satisfied with his lot is rich;

he who goes on acting with energy has a (firm) will.

He who does not fail in the requirements of his position, continues long;

he who dies and yet does not perish, has longevity.