My internal and external life depend so much on the work of others that I must make an extreme effort to give as much as I receive.

Although words exist for the most part for the transmission of ideas, there are some which produce such violent disturbance in our feelings that the role they play in the transmission of ideas is lost in the background.

If I had my life to live over again, I would elect to be a trader of goods rather than a student of science. I think barter is a noble thing.

Only the [Catholic] Church stood squarely across the path of Hitler’s campaign for suppressing truth. I never had any special interest in the Church before, but now I feel a great affection and admiration because the Church alone has had the courage and persistence to stand for intellectual truth and moral freedom. I am forced thus to confess that what I once despised I now praise unreservedly.

Make everything as simple as possible, but not simpler.

The power of imagination is the ultimate creative power.. no doubt about that. While knowledge defines all we currently know and understand.. imagination points to all we might yet discover and create. Imagination is more important than knowledge. Your imagination is your preview of life's coming attractions

The true measure of a man is the degree to which he has managed to subjugate his ego.