There is always some madness in love. But there is also always some reason in madness.
If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.
The lion and the calf shall lie down together but the calf won't get much sleep.
Shake off all the fears of servile prejudices, under which weak minds are servilely crouched. Fix reason firmly in her seat, and call on her tribunal for every fact, every opinion. Question with boldness even the existence of a God; because, if there be one, he must more approve of the homage of reason than that of blindfolded fear.
A man is too apt to forget that in this world he cannot have everything. A choice is all that is left him.
He who will not reason is a bigot; he who cannot is a fool; and he who dares not is a slave.
The release of atomic energy has not created a new problem. It has merely made more urgent the necessity of solving an existing one.