The most important thing in mathematics is to understand the concepts, not just to memorize the formulas.

Every piece of plastic we don't recycle is a failure of our system and our responsibility.

应对这个世界的唯一方式就是嘲笑它。

In the midst of change, leaders must be the anchors of stability.

A day wasted on others is not wasted on one's self.

成功不是幸福的关键。幸福才是成功的关键。如果你热爱你所做的事情，你就会成功。