The only unchangable certainty in life is that nothing is unchangable or certain.

The earth, the sea and air are the concern of every nation. And science, technology, and education can be the ally of every nation.

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.

As far as the job of President goes, its rewarding and I've given before this group the definition of happiness for the Greeks. I'll define it again: the full use of your powers along lines of excellence. I find, therefore, that the Presidency provides some happiness.

It is not our wealth that built our roads, but it is our roads that built our wealth.

For plague and pestilence, plunder and pollution, the hazards of nature and the hunger of children are the foes of every nation. The earth, the sea and the air are the concern of every nation.

This knowledge, the knowledge that the physical well-being of the citizen is an important foundation for all of the activities of the nation, is as old as Western civilization itself.