You can't change the past, but you can shape the future.

我告诉你，德并不是用钱买来的，但是德却可以带来金钱。

A computer program does what you tell it to do, not what you want it to do.

The only way to learn mathematics is to do mathematics.

I don’t regret the things I’ve done, I regret the things I didn’t do when I had the chance.