"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.'"

"The pioneer in a new field of knowledge is never a popular man."

"The history of science shows that the human mind is capable of understanding the most complex phenomena."

"Science advances funeral by funeral."

"A scientist must be a man of faith, not in the sense of a believer in dogma, but in the sense of a man who believes in the possibility of discovering new truths."