Student is not a container you have to fill but a torch you have to light up.

Out of clutter, find simplicity.

Conscious man, to be sure, has at all times been keenly aware that life is an adventure, that life must, forever, be wrested from death.

I have made no secret, either privately or publicly, of any sense of outrage over officially enforced military and war service. I regard it as a duty of conscience to fight against such barbarous enslavement of the individual with every means available.

We should take care not to make the intellect our god; it has, of course, powerful muscles, but no personality.

Understanding physics is child's play when compared to understanding child's play.

Consider the concepts referred to in the words 'where', 'when', 'why', 'being', to the elucidation of which innumerable volumes of philosophy have been devoted. We fare no better in our speculations than a fish which should strive to become clear as to what is water.