The only time you should look down on someone is when you're helping them up.

I'm not perfect, but I'm trying every day to be better than I was yesterday.

失败只是通往成功的垫脚石。

The most important part of teaching is to teach what it is to know.

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。