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.

Continuous effort - not strength or intelligence - is the key to unlocking our potential.

在任何情况下都要寻找积极的一面。总有一些值得感激的事情。

对这个世界有所助益是获得快乐的唯一途径。