Imagination is more important than knowledge.
When you are courting a nice girl an hour seems like a second. When you sit on a red-hot cinder a second seems like an hour. That's relativity.
Look deep into nature and you ll understand everything better.
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.
Science without religion is lame. Religion without science is blind.
Peace cannot be kept by force. It can only be achieved by understanding.
Try not to become a man of success, but rather a man of value.
We can't solve problems by using the same kind of thinking we used when we created them.
Learn from yesterday, live for today, hope for tomorrow. The important thing is not to stop questioning.
Not everything that counts can be counted, and not everything that can be counted counts.
I don't know with what weapons World War 3 will be fought, but World War 4 will be fought with sticks and stones.
Two things are infinite: the universe and human stupidity; I'm not sure about the universe.