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.