"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 spiritual world is the true reality."

"Truth never triumphs—its opponents just die out."

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

"Science cannot solve the ultimate mystery of nature. And that is because, in the last analysis, we ourselves are a part of nature and therefore a part of the mystery that we are trying to solve."