Albert Einstein

Any intelligent fool can make things bigger, more complex, and more violent. It takes a
  touch of genius -- and a lot of courage -- to move in the opposite direction.

Gravitation is not responsible for people falling in love.

The hardest thing in the world to understand is the income tax.

I never think of the future. It comes soon enough.

Science without religion is lame. Religion without science is blind.

Great spirits have often encountered violent opposition from weak minds.

Everything should be made as simple as possible, but not simpler.

The secret to creativity is knowing how to hide your sources.

We can't solve problems by using the same kind of thinking we used when
  we created them.

Education is what remains after one has forgotten everything he learned in school.

Do not worry about your difficulties in Mathematics. I can assure you, mine are still
  greater.

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

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

In order to form an immaculate member of a flock of sheep one must, above all, be a sheep.