你唯一应该努力超越的人，就是昨天的自己。
The only person you should try to be better than is the person you were yesterday.
在独裁统治下，时间停滞不前。
The only way to learn mathematics is to do mathematics.
The task of philosophy is not to resolve contradictions but to make them visible.
It requires indeed some courage to undertake a labor of such far-reaching extent.
I'm not perfect, and I don't pretend to be.
The best businesses solve real problems.