Your most unhappy customers are your greatest source of learning.

La mélancolie, c'est le bonheur d'être triste.

The wise person does not dogmatically assert anything， not even that the wise person knows nothing.

You cannot swim for new horizons until you have courage to lose sight of the shore.

You are no different than anybody else is.

居家时不是有才德的人，入朝做官也不是好官。小时候不是一个好的学生，将来不能够成为一个有才德的人。