I would not dare to say that there is a direct relation between mathematics and madness, but there is no doubt that great mathematicians suffer from maniacal characteristics.
悲伤是私人的事。它需要多久就会持续多久。
Intuition is really a sudden immersion of the soul into the universal current of life.
有时候你无法独自完成。
Nothing is certain， and nothing is impossible.