翻译：各种事情根据类别而聚集，万物根据类别而分为不同的群体。

Don’t create things to make money； make money so you can create things. The reward for good work is more work.

Every time we teach a child something, we keep him from inventing it himself.

Inside us there is something that has no name, that something is what we are.

In the realm of mathematics, every problem is an opportunity to discover something new.

我们学得越多，就越意识到我们不知道的还有很多。