种一棵树最好的时间是二十年前,其次是现在。
The best time to plant a tree was twenty years ago. The second best time is now.
真正的暴力是我们因为害怕做真实的自己而对自己施加的暴力。
研究的坚持是关键;自然只向有耐心的人揭示它的秘密。
The goal of mathematics is not to solve problems, but to understand them.