From Einstein's Mouth

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

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

Imagination is more important than knowledge...

My religion consists of a humble admiration of the illimitable superior spirit who reveals himself in the slight details we are able to perceive with our frail and feeble mind.

Reading, after a certain age, diverts the mind too much from its creative pursuits. Any man who reads too much and uses his own brain too little falls into lazy habits of thinking.

Reality is merely an illusion, albeit a very persistent one.

The most incomprehensible thing about the world is that it is at all comprehensible.

Science without religion is lame, religion without science is blind.
"Science, Philosophy and Religion: a Symposium", 1941

Everything that is really great and inspiring is created by the individual who can labor in freedom.
'Out of My Later Years,' 1950

You cannot simultaneously prevent and prepare for war.

At any rate, I am convinced that He does not play dice.
On God in a letter to Max Born, 1926

If A is success in life, then A equals x plus y plus z. Work is x; y is play; and z is keeping your mouth shut.
Observer, Jan. 15, 1950