The world is a mirror, and we see in it what we are.
世界是一面镜子,我们在其中看到自己。
If a problem cannot be solved, enlarge it.
If you're not failing, you're not pushing hard enough.
数学证明的优雅在于它的简洁和清晰。
A long habit of not thinking a thing wrong gives it a superficial appearance of being right.