The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking.”

Logic will get you from A to Z; imagination will get you everywhere.

I have no special talents. I am only passionately curious.

Peace can not kept by force; it can only be achieved by understanding.

I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.

Learn from yesterday, live for today, think for tomorrow.

Technological progress is like an axe in the hands of a pathological criminal.

A clever person solves a problem. A wise person avoids it.

There are only two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle.

If you can't explain it to a six year old, you don't understand it yourself.

Gravitation is not responsible for people falling in love.

You never fail until you stop trying.

Imagination is everything. It is the preview of life's coming attractions.

Life is like riding a bicycle. To keep your balance, you must keep moving.

Two things are infinite: the universe and human stupidity; and I’m not sure about the universe.

Great spirits have always encountered violent opposition from mediocre minds.

Anyone who has never made a mistake has never tried anything new.

I do not know if all cops are poets, but I know that all cops carry guns with triggers.

Being negative only makes a difficult journey more difficult. You may be given a cactus, but you don't have to sit on it.

Twas doing nothing was his curse. Is there a vice can plague us worse?

It is not in the stars to hold our destiny but in ourselves.

The four most beautiful words in our common language: I told you so.

Let us be grateful to people who make us happy, they are the charming gardeners who make our souls blossom.

Happiness is the interval between periods of unhappiness.

I know a man who gave up smoking, drinking, sex, and rich food. He was healthy right up to the day he killed himself.

It's true hard work never killed anybody, but I figure, why take the chance?