《道德经》第三十三章
知人者智，自知者明。胜人者有力，自胜者强。知足者富。强行者有志。
不失其所者久。死而不亡者寿。
《Tao-Te Ching》Chapter 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.
【易解】
了解别人则智，敏慧自知则明。战胜别人的有力，战胜自己的强。知足就是富有，坚持力行就是有志，不离失他所维系、归依的道的可以长久，身虽死而事业精神流传就是长生。
道德经全文及译文