Insight must precede application.

Scientific work will never stop, and it would be terrible if it did. If there were no more problems, you would put your hands in your pockets and your head on a pillow and would work no more. In science rest is stagnation, rest is death.

We have no right to assume that any physical laws exist, or if they have existed up until now, that they will continue to exist in a similar manner in the future.

No burden is so heavy for a man to bear as a succession of happy days.

There is no matter as such—mind is the matrix of all matter.

Scientific discovery and scientific knowledge have been achieved only by those who have gone in pursuit of it without any practical purpose whatsoever in view.

Religion and natural science are fighting a joint battle in an incessant, never-relaxing crusade against skepticism and dogmatism, against disbelief and against superstition, and the rallying cry in this crusade has always been, and will always be, 'On to God.'