人生的真正意义在于种树，虽然你并不期待坐在树荫下。
The true meaning of life is to plant trees, under whose shade you do not expect to sit.
如果你没有失败，说明你还不够努力。
一切迄今为止社会的历史都是阶级斗争的历史。
Mathematics is not about numbers, equations, computations, or algorithms: it is about understanding.
数学不是关于数字、方程、计算或算法的：它是关于理解的。
Twenty years from now you will be more disappointed by the things that you didn’t do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.