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.

写作就像用文字绘画，创造出活在读者心中的图像。

如果你没有偶尔失败，说明你还不够努力。

现在的你，已经足够好了。

在数学中，提出问题的艺术必须比解决问题更有价值。