我们不是因为变老而停止玩耍,而是因为停止玩耍而变老。
真相往往隐藏在显而易见之处。
I think that the best way to predict the future is to create it.
生活的目的不是快乐。它是有用的,是光荣的,是富有同情心的,是让你活得有意义,活得好。
In science, we try to explain what we don't understand. In mathematics, we try to understand what we can't explain.