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.

价的概念是所有结构化学的基础。