我们进步的考验不在于我们是否为那些已经拥有很多的人增加更多，而在于我们是否为那些拥有太少的人提供足够的帮助。
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.
The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.
The true discovery of America is before us. The true fulfillment of our spirit, of our people, of our mighty and immortal land, is yet to come.
"Books are the keys to unlocking our understanding of others."
世界是一本书，不旅行的人只读了一页。