The most beautiful thing we can experience is the mysterious. It is the source of all true art and science.
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.
If you are out to describe the truth, leave elegance to the tailor.
If the facts don't fit the theory, change the facts.
If I had only known, I would have been a locksmith.
I never think of the future -- it comes soon enough.
I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.
Everything should be made as simple as possible, but not one bit simpler.
As far as the laws of mathematics refer to reality, they are not certain; and as far as they are certain, they do not refer to reality.
He's such a dangerous handyman that his toolbox has a siren on it.