The very essence of the creative is its novelty, and hence we have no standard by which to judge it.

人们常只想到自己的需要，而没考虑自己的能力。

我是个幸存者，我不会放弃，我不会停下，我会更加努力。

The American farmer is the only man in our economy who has to buy everything he buys at retail, sell everything he sells at wholesale, and pay the freight both ways.

数学是人类精神最美丽、最强大的创造。

解析：告诫人们要珍惜所得。