Liberty is obedience to self-imposed law.

Never stop learning, because the world never stops changing.

勇气不是没有恐惧，而是战胜恐惧。

美好生活就是每天运用你的突出优势来创造真实的幸福和丰富的满足感。

I don't believe in diversification. I prefer to concentrate on a few good ideas.

经济不平等不仅是一个道德问题，也是一个经济问题。