Never try to discourage thinking, for you are sure to succeed.
Every book is a journey, and every journey is a book.
我寻找钥匙多年,但门一直是开着的。
数学的研究就像空气或重力——它无处不在,你看不到它,但你知道它在那里。
Failure is interesting—it’s part of making progress. You never learn from success, but you do learn from failure.
名誉是一件无聊的骗人的东西;得到它的人未必有什么功德,失去它的人也未必有什么过失。