如果你想在数学上取得进步，你必须习惯于不舒服。

It seems to me that if you or I must choose between two courses of thought or action, we should remember our dying and try so to live that our death brings no pleasure to the world.

当我走出囚室、迈过通往自由的监狱大门时，我已经清楚，自己若不能把悲痛与怨恨留在身后，那么我其实仍在狱中。