It is not the possession of truth, but the success which attends the seeking after it, that enriches the seeker and brings happiness to him.

A scientist is happy, not in resting on his attainments but in the steady acquisition of fresh knowledge.

A new truth always has to conend with many difficulties. If it were not so, it would have been discovered much sooner.

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.'

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.

Every advance in knowledge brings us face to face with the mystery of our own being.

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.