Do not fear to be eccentric in opinion, for every opinion now accepted was once eccentric.
切勿为自己独特的想法而恐惧，因为我们现在所接受的常识都曾是独特的。
审判自己比审判别人要难得多啊！你要是能审判好自己，你就是一个真正有才智的人。
The true test of a mathematical idea is its ability to inspire further questions.
书籍是灵魂的镜子。