There is no man, however wise, who has not at some period of his youth said things, or lived in a way the consciousness of which is so unpleasant to him in later life that he would gladly, if he could, expunge it from his memory.
The greatest gift you can give someone is your time.
Thought is the most difficult task, which is why so few engage in it.
【译文】广泛学习钻研,坚定自己的志向,恳切地提出问题并且联系实际去思考,仁德就在其中了。