John Fitzgerald Kennedy

Ask not what your country can do for you — ask what you can do for your country.

Change is the law of life. And those who look only to the past or present are certain to miss the future.

Efforts and courage are not enough without purpose and direction.

The time to repair the roof is when the sun is shining.

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.

A man may die, nations may rise and fall, but an idea lives on.