数学的历史是人类思想和进步的历史。

Farmers are the original environmentalists; we must support them in this critical role.

现在如果送给别人很少的东西，却希望人家回报很多的东西，那么，人们就会怕你再送东西给自己了。 

史记

The rocks may be hard, but our resolve must be harder.