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| If anyone is crazy enough to want to kill a president of the United States, he can do it. All he must be prepared to do is give his life for the president's. | | Uncategorized | |
| If art is to nourish the roots of our culture, society must set the artist free to follow his vision wherever it takes him. | | Art; Culture | |
| If I had to live my life over again, I would have a different father, a different wife and a different religion. | | Life | |
| If not us, who? If not now, when? | | Charity | |
| If scientific discovery has not been an unalloyed blessing, if it has conferred on mankind the power not only to create but also to annihilate, it has at the same time provided humanity with a supreme challenge and a supreme testing | | Discovery; Science; Testing | |
| If someone wants to shoot me from a window with a rifle, nobody can stop it, so why worry about it | | Uncategorized | |
| If this nation is to be wise as well as strong, if we are to achieve our destiny, then we need more new ideas for more wise men reading more good books in more public libraries. These libraries should be open to all—except the censor. We must know all the facts and hear all the alternatives and listen to all the criticisms. Let us welcome controversial books and controversial authors. For the Bill of Rights is the guardian of our security as well as our liberty. | | Books; Censorship | |
| If we are strong, our strength will speak for itself. If we are weak, words will be of no help. | | Communication | |
| If we cannot end our differences, at least we can help make the world safe for diversity | | Uncategorized | |
| If we cannot now end our differences, at least we can help make the world safe for diversity. | | Diversity | |
| In a time of turbulence and change, it is more true than ever that knowledge is power | | Uncategorized | |
| In a very real sense, it will not be one man going to the moon it will be an entire nation. For all of us must work to put him there. | | Uncategorized | |
| In giving rights to others which belong to them, we give rights to ourselves and to our country | | Civil rights; Right | |
| In the long history of the world, only a few generations have been granted the role of defending freedom in its hour of maximum danger. I do not shrink from this responsibility - I welcome it. | | Freedom; Generations | |
| In the past, those who foolishly sought power by riding on the back of the tiger ended up inside. | | Past; Power | |
| It is an unfortunate fact that we can secure peace only by preparing for war. | | Uncategorized | |
| It is in the American tradition to stand up for one's rights - even if the new way to stand up for one's rights is to sit down | | America and Americans | |
| It is our task in our time and in our generation, to hand down undiminished to those who come after us, as was handed down to us by those who went before, the natural wealth and beauty which is ours. | | Uncategorized | |
| It might be said now that I have the best of both worlds. A Harvard education and a Yale degree. | | Uncategorized | |
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