The world breaks everyone, and afterward, many are strong at the broken places.

Deciding what not to do is as important as deciding what to do.

Common sense tells us that performance comes and goes, but costs go on forever.

A good mathematician is one who can see analogies between theorems; a great mathematician is one who can see analogies between analogies.

有时，生活中最重要的东西是我们看不见或摸不着的，但我们可以在心中感受到它们。