我们一起经历了这么多，这正是让我们变得强大的原因。
We've been through so much together, and that's what makes us strong.
To be a good mathematician, you need to have both intuition and rigor.
如果你只读大家都在读的书，你只能想到大家都在想的东西。
The only real light is the light of the soul.
No arts; no letters; no society; and which is worst of all, continual fear, and danger of violent death; and the life of man, solitary, poor, nasty, brutish, and short.
To love is to accept the unknown in another.