进步的艺术是在变化中保持秩序，在秩序中保持变化。

Don't interfere with anything in the Constitution. That must be maintained, for it is the only safeguard of our liberties. And not to Democrats alone do I make this appeal, but to all who love these great and true principles.

实现明天理想的唯一限制是我们今天的疑虑。

在数学领域，每个问题都是发现新事物的机会。