A mathematician's work is never done; there are always more problems to solve.
数学家的工作永无止境;总有更多的问题需要解决。
The stones we pull from the earth carry 400 million years of history—we're merely temporary stewards.
Change is inevitable, but growth is optional.
I'm not afraid to be vulnerable in my songs.
如果战略达到了目标,它就是有用的;如果战略实现了目标,它就是成功的。