The essence of mathematics is not just in solving problems but in asking the right questions.

译文：以前的过失，要全部拔掉，犹如昨天的你已经死去；你从今以后，要全新做人，犹如今天的你获得新生。

Every saint has a past, and every sinner has a future.

I can't relate to lazy people. We don't speak the same language. I don't understand you. I don't want to understand you.

The duty of man is the same in respect to his own nature as in respect to the nature of all other things.