发现的快乐不在于认可，而在于知道你贡献了有意义的东西。
The joy of discovery is not in the recognition but in the knowledge that you’ve contributed something meaningful.
所有模型都是错误的，但有些是有用的。
The purpose of computing is insight, not numbers.
The world owes all its onward impulses to men ill at ease. The happy man inevitably confines himself within ancient limits.
Whatever you're meant to do, do it now. The conditions are always impossible.