The behavior of the whole cannot be predicted from the behavior of its parts taken separately.
Innovation is the soul of an enterprise; without innovation, there is no future.
数学是一门活生生的学科,随着新思想的出现而不断发展。
I write to understand, to grasp the reality that escapes me.
I don't wait for moods. You accomplish nothing if you do that. Your mind must know it has got to get down to work.