为文之道，贵在自得。
写文章的方法，最重要的是要有自己的心得体会。
The most powerful tool for improving decisions is feedback.
数学的本质不是使简单的事情复杂化，而是使复杂的事情简单化。
The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it.
我想我是不敢开心了，因为每次都会乐极生悲。