科学家是务实的人，他们的目标是实际的。他们不追求终极，而是追求接近。
We die. That may be the meaning of life. But we do language. That may be the measure of our lives.
Three things are necessary for the salvation of man: to know what he ought to believe； to know what he ought to desire； and to know what he ought to do.
The only way to have a friend is to be one.
