It is an unfortunate fact that we can secure peace only by preparing for war.

Mankind must put an end to war - or war will put an end to mankind.

[Address before the United Nations, September 25 1961]

The world knows that America will never start a war. This generation of Americans has had enough of war and hate... we want to build a world of peace where the weak are secure and the strong are just.

It is an unfortunate fact that we can secure peace only by preparing for war.

To secure peace is to prepare for war.

We set sail on this new sea because there is new knowledge to be gained, and new rights to be won, and they must be won and used for the progress of all people. For space science, like nuclear science and technology, has no conscience of its own. Whether it will become a force for good or ill depends on man, and only if the United States occupies a position of preeminence can we help decide whether this new ocean will be a sea of peace or a new terrifying theater of war.