"I am sorry to say that there is too much point to the wisecrack that life is extinct on other planets because their scientists were more advanced than ours."

"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."

"A nation which has forgotten the quality of courage which in the past has been brought to public life is not as likely to insist upon or regard that quality in its chosen leaders today - and in fact we have forgotten."

"Change is the law of life. And those who look only to the past or present are certain to miss the future."

"The path we have chosen for the present is full of hazards, as all paths are. The cost of freedom is always high, but Americans have always paid it. And one path we shall never choose, and that is the path of surrender, or submission."

"We believe that if men have the talent to invent new machines that put men out of work, they have the talent to put those men back to work."

"Physical fitness is not only one of the most important keys to a healthy body, it is the basis of dynamic and creative intellectual activity."

"The great enemy of the truth is very often not the lie, deliberate, contrived and dishonest, but the myth, persistent, persuasive and unrealistic."

"Now we have a problem in making our power credible, and Vietnam is the place."

"Tolerance implies no lack of commitment to one's own beliefs. Rather it condemns the oppression or persecution of others."

"My father always told me that all businessmen were sons of bitches, but I never believed it till now."

"There are many people in the world who really don't understand-or say they don't-what is the great issue between the free world and the Communist world. Let them come to Berlin!"

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

"For time and the world do not stand still. Change is the law of life. And those who look only to the past or the present are certain to miss the future."

"To state the facts frankly is not to despair the future nor indict the past. The prudent heir takes careful inventory of his legacies and gives a faithful accounting to those whom he owes an obligation of trust."

"The courage of life is often a less dramatic spectacle than the courage of a final moment; but it is no less a magnificent mixture of triumph and tragedy."

"Mankind must put an end to war before war puts an end to mankind."

"Efforts and courage are not enough without purpose and direction."

"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."

"If a free society cannot help the many who are poor, it cannot save the few who are rich."

"We prefer world law in the age of self-determination to world war in the age of mass extermination."

"Khrushchev reminds me of the tiger hunter who has picked a place on the wall to hang the tiger's skin long before he has caught the tiger. This tiger has other ideas."

"A nation that is afraid to let its people judge the truth and falsehood in an open market is a nation that is afraid of its people."

"The very word 'secrecy' is repugnant in a free and open society; and we are as a people inherently and historically opposed to secret societies, to secret oaths, and to secret proceedings."

"History is a relentless master. It has no present, only the past rushing into the future. To try to hold fast is to be swept aside."

"There are risks and costs to action. But they are far less than the long range risks of comfortable inaction."

"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."

"We cannot expect that all nations will adopt like systems, for conformity is the jailer of freedom and the enemy of growth."

"Our growing softness, our increasing lack of physical fitness, is a menace to our security."

"America has tossed its cap over the wall of space."

"Our most basic common link is that we all inhabit this planet. We all breathe the same air. We all cherish our children's future. And we are all mortal."

"Peace is a daily, a weekly, a monthly process, gradually changing opinions, slowly eroding old barriers, quietly building new structures."

"We are tied to the ocean. And when we go back to the sea, whether it is to sail or to watch - we are going back from whence we came."

"I look forward to a great future for America - a future in which our country will match its military strength with our moral restraint, its wealth with our wisdom, its power with our purpose."

"Forgive your enemies, but never forget their names."

"Those who make peaceful revolution impossible will make violent revolution inevitable."

"I think this is the most extraordinary collection of talent, of human knowledge, that has ever been gathered at the White House - with the possible exception of when Thomas Jefferson dined alone."

"As we express our gratitude, we must never forget that the highest appreciation is not to utter words, but to live by them."

"If we cannot now end our differences, at least we can help make the world safe for diversity."

"Sure it's a big job; but I don't know anyone who can do it better than I can."

"Too often we... enjoy the comfort of opinion without the discomfort of thought."

"Our progress as a nation can be no swifter than our progress in education. The human mind is our fundamental resource."

"Let every nation know, whether it wishes us well or ill, that we shall pay any price, bear any burden, meet any hardship, support any friend, oppose any foe to assure the survival and the success of liberty."

"Domestic policy can only defeat us; foreign policy can kill us."

"Let us not seek the Republican answer or the Democratic answer, but the right answer. Let us not seek to fix the blame for the past. Let us accept our own responsibility for the future."

"I hope that no American will waste his franchise and throw away his vote by voting either for me or against me solely on account of my religious affiliation. It is not relevant."

"Geography has made us neighbors. History has made us friends. Economics has made us partners, and necessity has made us allies. Those whom God has so joined together, let no man put asunder."

"A man may die, nations may rise and fall, but an idea lives on."

"I am the man who accompanied Jacqueline Kennedy to Paris, and I have enjoyed it."

"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."