It is a magnificent feeling to recognize the unity of complex phenomena which appear to be things quite apart from the direct visible truth.

You are right in speaking of the moral foundations of science, but you cannot turn around and speak of the scientific foundations of morality.

The mind can proceed only so far upon what it knows and can prove. There comes a point where the mind takes a higher plane of knowledge, but can never prove how it got there. All great discoveries have involved such a leap

Be a loner. That gives you time to wonder.

Freedom of teaching and of opinion in book or press is the foundation for the sound and natural development of any people.

I owe as much of my success to an uncompromising obstinacy as to any original ideas.

Some men spend a lifetime in an attempt to comprehend the complexities of women. Others pre-occupy themselves with somewhat simpler tasks, such as understanding the theory of relativity!