The past is always there, but it's not the only thing that's there.
优秀的数学家应该既严谨又富有想象力。
阅读是不动的旅行,写作是不旅行的移动。
The mathematician's patterns, like the painter's or the poet's, must be beautiful; the ideas, like the colors or the words, must fit together in a harmonious way.