“Many Americans make the mistake of assuming that space research has no values here on earth. Nothing could be further from the truth. Just as the wartime development of radar gave us the transistor, and all that it made possible, so research in space medicine holds the promise of substantial benefit for those of us who are earthbound. For our effort in space is not as some have suggested, a competitor for the natural resources that we need to develop the earth. It is a working partner and a coproducer of these resources. And nothing makes this clearer than the fact that medicine in space is going to make our lives healthier and happier here on earth.”

Sestina of the Space Rocket (1953)

Quoted in

We'll Never Conquer Space (1960)
Context: We have abolished space here on the little Earth; we can never abolish the space that yawns between the stars. Once again, as in the days when Homer sang, we are face-to-face with immensity and must accept its grandeur and terror, its inspiring possibilities and its dreadful restraints.

1965. Quoted in The Daily Review.

Speech on new space exploration initiatives http://georgewbush-whitehouse.archives.gov/news/releases/2004/01/20040114-3.html (January 14, 2004)
2000s, 2004

1961, Speech to Special Joint Session of Congress
Context: Finally, if we are to win the battle that is now going on around the world between freedom and tyranny, the dramatic achievements in space which occurred in recent weeks should have made clear to us all, as did the Sputnik in 1957, the impact of this adventure on the minds of men everywhere, who are attempting to make a determination of which road they should take. […] Now it is time to take longer strides — time for a great new American enterprise — time for this nation to take a clearly leading role in space achievement, which in many ways may hold the key to our future on earth. I believe we possess all the resources and talents necessary. But the facts of the matter are that we have never made the national decisions or marshaled the national resources required for such leadership. We have never specified long-range goals on an urgent time schedule, or managed our resources and our time so as to insure theft fulfillment. Recognizing the head start obtained by the Soviets with their large rocket engines, which gives them many months of lead-time, and recognizing the likelihood that they will exploit this lead for some time to come in still more impressive successes, we nevertheless are required to make new efforts on our own. For while we cannot guarantee that we shall one day be first, we can guarantee that any failure to make this effort will make us last. We take an additional risk by making it in full view of the world, but as shown by feat of astronaut Shepard, this very risk enhances our stature when we are successful. But this is not merely a race. Space is open to us now; and our eagerness to share its meaning is not governed by the efforts of others. We go into space because whatever mankind must undertake, free men must fully share.

Cosmos: A Personal Voyage (1990 Update), The Shores of the Cosmic Ocean [Episode 1]
Context: We on Earth have just awakened to the great oceans of space and time from which we have emerged. We are the legacy of 15 billion years of cosmic evolution. We have a choice: We can enhance life and come to know the universe that made us, or we can squander our 15 billion-year heritage in meaningless self-destruction. What happens in the first second of the next cosmic year depends on what we do, here and now, with our intelligence and our knowledge of the cosmos.

1963, President John F. Kennedy's last formal speech and public words
Context: I think the United States should be a leader. A country as rich and powerful as this which bears so many burdens and responsibilities, which has so many opportunities, should be second to none. And in December, while I do not regard our mastery of space as anywhere near complete, while I recognize that there are still areas where we are behind — at least in one area, the size of the booster — this year I hope the United States will be ahead. And I am for it. We have a long way to go. Many weeks and months and years of long, tedious work lie ahead. There will be setbacks and frustrations and disappointments. There will be, as there always are, pressures in this country to do less in this area as in so many others, and temptations to do something else that is perhaps easier. But this research here must go on. This space effort must go on. The conquest of space must and will go ahead. That much we know. That much we can say with confidence and conviction.

Opening address to the Commonwealth Parliamentary Association conference in Nadi, 6 September 2005.