The further the spiritual evolution of mankind advances, the more certain it seems to me that the path to genuine religiosity does not lie through the fear of life, and the fear of death, and blind faith, but through striving after rational knowledge.

Never lose a holy curiosity.

If everybody lived as I do, surely the writing of romance novels would never have come into being.

The greatest scientists are artists as well.

In order to be an immaculate member of a flock of sheep, one must above all be a sheep oneself.

During the last century, and part of the one before, it was widely held that there was an unreconcilable conflict between knowledge and belief.

Certainly there are things worth believing. I believe in the brotherhood of man and the uniqueness of the individual. But if you ask me to prove what I believe, I can't. You know them to be true but you could spend a whole lifetime without being able to prove them. The mind can proceed only so far upon what it knows and can prove. There comes a point where the mind takes a leap—call it intuition or what you will—and comes out upon a higher plane of knowledge, but can never prove how it got there. All great discoveries have involved such a leap.