Don't be defined by what you didn't know or didn't do.
The best prophet of the future is the past.
盈利和环境保护可以而且必须齐头并进。
I'm not perfect, I don't claim to be. But I'm trying.
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。
最好的投资是那些正在建设未来的人。