We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard, because that goal will serve to organize and measure the best of our energies and skills, because that challenge is one that we are willing to accept, one we are unwilling to postpone, and one which we intend to win, and the others, too.

The success of any political system depends on its ability to deliver both prosperity and justice.

The key to solving complex problems is often to find the right abstraction that simplifies the problem without losing its essential features.