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

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

The ignorance of one voter in a democracy impairs the security of all.

It is insane that two men, sitting on opposite sides of the world, should be able to decide to bring an end to civilization.

Those who do nothing are inviting shame as well as violence. Those who act boldly are recognizing right as well as reality.

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.

We need people who can dream of things that never were.

It is an unfortunate fact that we can secure peace only by preparing for war.

Democracy may not be perfect, but at least I don’t have to build a wall to keep my people in.

Every accomplishment starts with the decision to try.

Peace need not be impracticable, and war need not be inevitable.

One person can make a difference, and everyone should try.

Great crises produce great men, and great deeds of courage.

We stand for freedom. That is our conviction for ourselves; that is our only commitment to others.

The one unchangeable certainty is that nothing is unchangeable or certain.

History will never accept difficulties as an excuse.

The time to repair the roof is when the sun is shining.

There’s no doubt. Its certain that ill be 100 percent

The individual man is an insoluble puzzle, in the aggregate he becomes a mathematical certainty.

What makes a song last is real content from a mind that is thinking a little bit harder about certain things. A lot of artists don’t really think that hard.

The soul helps the body, and at certain moments raises it. It is the only bird that sustains its cage.

An atheist is someone who is certain that God does not exist, someone who has compelling evidence against the existence of God.

At a certain point, if you chase two rabbits, you lose them both.

I don’t know anything with certainty, but seeing the stars makes me dream.

Except in pure mathematics, nothing is known for certain (although much is certainly false).