数学研究是所有智力和精神进步不可或缺的基础。

预测未来的最好方式就是创造未来。

小说的真实不在于事实，而在于情感上的诚实。

估计问题的性质不同。在这里，我们不关心检验特定的假设，而是关心估计参数的值。

整个科学不过是日常思维的提炼。

I constantly see people rise in life who are not the smartest, sometimes not even the most diligent, but they are learning machines. They go to bed every night a little wiser than they were when they got up.