贫困和无知可能逐渐消失的希望，很大程度上源于十九世纪工人阶级的稳步进步。

幸福存在于内心。

Lock up your libraries if you like; but there is no gate, no lock, no bolt that you can set upon the freedom of my mind.

You have to have fun in life, otherwise you’re just going to be miserable.

勇气是人类最重要的一种特质，倘若有了勇气，人类其他的特质自然也就具备了。