我思故我在。

If you're not stubborn， you'll give up on experiments too soon. And if you're not flexible， you'll pound your head against the wall and you won't see a different solution to a problem you're trying to solve.

除非你决定如此，否则你不会被困在原地。

"The best way to lead is by example."

想要制服洋人的祸患，必先熟悉洋人的国情。

"The simplest stories often have the deepest meanings."