To write a good love letter， you ought to begin without knowing what you mean to say， and to finish without knowing what you have written.
要写一封好的情书，你应该在不知道要说什么的情况下开始写，然后在不知道自己写了什么的情况下结束。
A proposition is an assertion that something is or is not the case.
The real challenge in computer science is not to write programs, but to understand the nature of computation.
"And this I believe: that the free, exploring mind of the individual human is the most valuable thing in the world. And this I would fight for: the freedom of the mind to take any direction it wishes, undirected."
偏执只是无知的另一个词。