幸福通过美德获得；它是人通过自己的意志获得的美好。
Happiness is secured through virtue; it is a good attained by man's own will.
Nature is the greatest teacher and I learn from her best when others are asleep.
It is not the strongest of the species that survives, nor the most intelligent, but the one most responsive to change.
复杂是你的敌人。任何傻瓜都能把事情复杂化。
我不是政治家，我只是一个关心的公民。
实现明天理想的唯一障碍是今天的疑虑。