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

It is never possible to predict a physical occurrence with unlimited precision.

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.'

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

Science advances one funeral at a time.

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 new scientific truth is usually not propagated in such a way that opponents become convinced and discard their previous views. No, the adversaries eventually die off, and the upcoming generation is familiarised anew with the truth.