读古人书，与贤人交游，最不可苟为同，又不可苟为异。二者之失，总是胸无定力，学问中便有时势趋附，非谄即矫耳。
读古人的著作，与贤能的人交往，最忌讳轻率地表示附和赞同，也不能够轻率地表示异议。之所以会犯这两种过失，都是由于心中缺乏主见，做学问时就掺杂有趋炎附势的成分，不是曲意逢迎便是虚伪矫饰。
"Understanding the limits of computation is as important as expanding its capabilities."
I would say that in the long run probably Communist China is likely to be in more of an expansionist phase than Soviet Russia...In their tactics, the Chinese Communists are probably the greater menace;
To love is to risk, but it is a risk worth taking.
记忆是个奇怪的东西，它不像相机或录音机那样工作，它会重建事物，用现在的剪刀剪辑过去。
A book is a mirror: if an ass peers into it, you can't expect an apostle to look out.
