自行车是我改变的工具。它是我产生影响的手段。

永远不要停止学习，一旦停止，你就会开始落后。

There is no point treating a depressed person as though she were just feeling sad, saying, 'There now, hang on, you'll get over it.' Sadness is more or less like a head cold- with patience, it passes. Depression is like cancer.

The most exciting moments in mathematics are when you realize that two seemingly unrelated areas are deeply connected.