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

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

Ego is the immediate dictate of human consciousness.

Experiment is the only means of knowledge at our disposal. Everything else is poetry, imagination.

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 scientific truth does not triumph by convincing its opponents and making them see the light, but rather because its opponents eventually die and a new generation grows up that is familiar with it.

Anybody who has been seriously engaged in scientific work of any kind realizes that over the entrance to the gates of the temple of science are written the words: 'Ye must have faith.'