除非定理是美丽的，否则它们毫无价值。
思考是具有生存价值的生物功能。
只要心意不放纵，就不会出现差错；只要用心不怠惰疏忽，就没有不能坚守的、随意放纵的志向。
Do just once what others say you can't do, and you will never pay attention to their limitations again.
The difference between ordinary and extraordinary is that little extra.
A good abstraction is one that emphasizes the important details and suppresses the unimportant ones.