It is easier to write an incorrect program than understand a correct one.
I don't believe in principles, in case you haven't noticed.
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。
The question is not how to get cured, but how to live.
不要让任何人告诉你你不能做某事
The relation between what we see and what we know is never settled.
要有劳苦的心志,乐观的意趣;宏大的气度,谨慎的言行。