The greatest discovery of my generation is that a human being can alter his life by altering his attitudes.
我不考虑年龄。我考虑的是生活和活着。
The past is always present, and the present is always past.
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。
I embrace challenges because they make me stronger.