The only person you should try to be better than is the person you were yesterday.

The essence of science is to ask the right questions.

从更糟到更好的改变也并非没有不便。

最好的肥料是农民在田间的身影。

面对各种诱惑而能拒之于外，这才是聪明之举；面对艰难坎坷而能站得稳，这才是意志坚定。