A mathematician's work is never done; there are always more problems to solve.
We are all fools in love.
I cannot fix on the hour, or the spot, or the look, or the words, which laid the foundation. It is too long ago. I was in the middle before I knew that I had begun.
政策制定者的挑战是创造一个信息自由高效流动的环境，使市场能够最佳运作。
The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.
A smooth sea never made a skilled sailor.