In computational complexity, we are not just dealing with the limits of what we can compute, but also with the limits of what we can prove.

The past is what you remember, imagine you remember, convince yourself you remember, or pretend you remember.

理论是灰色的，而生活之树常青。

这个世界不是因为你能做什么，而是你该做什么。

The purpose of psychology is to understand how we cope with the world.