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.

Auteur: Lao Tzu