We must live our lives in such a way that our children, and their children after them, will form a natural and lasting commitment to the vigorous life. Only in this way can we be assured that the spirit and strength of America will be constantly replenished.

A young man who does not have what it takes to perform military service is not likely to have what it takes to make a living. Today's military rejects include tomorrow's hard-core unemployed.

Diplomacy and defense are not substitutes for one another. Either alone would fail.

Everywhere immigrants have enriched and strengthened the fabric of American life.

The great enemy of truth is very often not the lie--deliberate, contrived and dishonest--but the myth--persistent, persuasive and unrealistic. Too often we hold fast to the cliches of our forebears. We subject all facts to a prefabricated set of interpretations. We enjoy the comfort of opinion without the discomfort of thought.

[War] can no longer be of concern to great powers alone.

Perhaps scientists have been the most international of all professions in their outlook... Every time you scientists make a major invention, we politicians have to invent a new institution to cope with it-and almost invariably, these days, it must be an international institution.