Have the courage to take your own thoughts seriously, for they will shape you.

I believe in mystery and, frankly, I sometimes face this mystery with great fear. In other words, I think that there are many things in the universe that we cannot perceive or penetrate, and that also we experience some of the most beautiful things in life only in a very primitive form. Only in relation to these mysteries do I consider myself to be a religious man.

Only world law can assure progress towards a civilized peaceful community.

If you can't explain what you are doing to a nine-year-old, then either you still don't understand it very well, or it's not all that worthwile in the first place.

When I study philosophical works I feel I am swallowing something which I don't have in my mouth.

I am a Jew, but I am enthralled by the luminous figure of the Nazarene….No one can read the Gospels without feeling the actual presence of Jesus.

The human mind has first to construct forms, independently, before we can find them in things.