In a time of turbulence and change, it is more true than ever that knowledge is power.

You know nothing for sure...except the fact that you know nothing for sure.

There is, in addition to a courage with which men die; a courage by which men must live.

Our problems are man-made, therefore they may be solved by man. And man can be as big as he wants. No problem of human destiny is beyond human beings.

The Kennedy Administration's public pronouncements on the matter suggested that the presence of Soviet nuclear missiles in Castro's Cuba would represent an unacceptable strategic threat to the United States. . . . This urgent transformation of Cuba into an important strategic base - by the presence of these large, long-range, and clearly offensive weapons of sudden mass-destruction - constitutes an explicit threat to the peace and security of all the Americas. . . .

You have, at the same time, placed your confidence in me, and in my ability to render a free, fair judgment - to uphold the Constitution and my oath of office - and to reject any kind of religious pressure or obligation that might directly or indirectly interfere with my conduct of the Presidency in the national interest.

There is a connection, hard to explain logically but easy to feel, between achievement in public life and progress in the arts.