No man can tame a tiger into a kitten by stroking it. There can be no appeasement with ruthlessness. There can be no reasoning with an incendiary bomb.

The only limit to our realization of tomorrow will be our doubts of today.

We must especially beware of that small group of selfish men who would clip the wings of the American Eagle in order to feather their own nests.

Remember, remember always, that all of us, and you and I especially, are descended from immigrants and revolutionists.

True individual freedom cannot exist without economic security and independence. People who are hungry and out of a job are the stuff of which dictatorships are made.

Never underestimate a man who overestimates himself.

People acting together as a group can accomplish things which no individual acting alone could ever hope to bring about.

Repetition does not transform a lie into a truth.

Human kindness has never weakened the stamina or softened the fiber of a free people. A nation does not have to be cruel to be tough.

The test of our progress is not whether we add more to the abundance of those who have much it is whether we provide enough for those who have little.

The only thing we have to fear is fear itself.

A common understanding is the pivot and a common way to bond the disintegrated

If you have food in your jaws you have solved all questions for the time being.

A retentive memory may be a good thing, but the ability to forget is the true token of greatness.

I consider myself an essayist and a fiction writer. In the essays, I certainly have been influenced by some of the leading science essayists. Like Loren Eiseley, Stephen Jay Gould, Lewis Thomas.

You must learn to see, what you are looking at

I felt more than ever the necessity of my mission. But I went home out of spirits, I hardly know why. I must work by myself all life long.

Sometimes people who get wealthy when they are very, very young, it's a curse to them. They don't realize it.

Despite the boredom of the infinity, we want life not shorter than the eternity!

You can play guitar in your canteen, you know, your hair might be longer, but there's a lot more to playing than travelling around universities and things.

A sound head, an honest heart, and an humble spirit are the three best guides through time and to eternity.