A fool who knows he is a fool is for that very reason a wise man. The fool who thinks he is wise is the one to be called a fool.

用心不能杂乱，杂乱则心神恍惚不能集中；用心不要劳累，劳累则精神疲倦不能有所收获。

Your work is going to fill a large part of your life， and the only way to be truly satisfied is to do what you believe is great work.

奋斗永不停息。