Thinking is the hardest work there is, which is probably the reason why so few engage in it.

The key to making money in stocks is not to get scared out of them.

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.

Quality should never be compromised for speed.

在数学中，提出问题的艺术必须比解决问题更有价值。