质量不是概念；它是一种现实。

认为有钟声会信号投资者何时进入或退出股市的想法根本不可信。

The purpose of psychology is to understand how life works.

I find I'm so excited. I can barely sit still or hold a thought in my head. I think it the excitement only a free man can feel, a free man at the start of a long journey whose conclusion is uncertain. I hope I can make it across the border.I hope the Pacific is as blue as it has been in my dreams. I hope to see my friend, and shake his hand. I hope.

数学发现的过程与发现本身同样重要。