People can be really smart or have skills that are directly applicable, but if they don't really believe in it, then they are not going to really work hard.

And I urge you to please notice when you are happy, and exclaim or murmur or think at some point, 'If this isn't nice, I don't know what is.'

The architecture of a system determines its behavior more than the content of its knowledge.

Keep your face always toward the sunshine—and shadows will fall behind you.

人不应该相信或不相信，而应该保持怀疑。