When you focus on doing what's right rather than what's easy, success follows naturally.
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.
解释:凡是有利的地方,虽然是极高的山,没有不可以上去的;即令有极深的水,没有不可以下去的。