记忆不是忠实的记录；它是对过去的主动重建。
每个程序都有（至少）两个目的：一个目的是为它编写的，另一个不是目的。
On pivoting: "If you're not stubborn， you'll give up on experiments too soon. And if you're not flexible， you'll pound your head against the wall and you won't see a different solution to a problem you're trying to solve."
The challenge in learning is not just to memorize, but to generalize from specific examples to broader concepts.