The test of our progress is not whether we add more to the abundance of those who have much; it is whether we provide enough for those who have too little.

目前生活中最悲哀的方面是，科学收集知识的速度比社会收集智慧的速度快。

当你怀疑自己的力量时，你就把力量给了你的怀疑。