知人者智，自知者明；勝人者有力，自勝者強。Knowing others is intelligence; knowing yourself is true wisdom. Mastering others is strength; mastering yourself is true power.

知人者智，自知者明；勝人者有力，自勝者強。

–老子，中國春秋時代思想家
Knowing others is intelligence; knowing yourself is true wisdom. Mastering others is strength; mastering yourself is true power.