I believe my theory of relativity to be true. But it will only be proved for certain in 1981, when I am dead.

It would be better if you began to teach others only after you yourself have learned something.

Science can only ascertain what is, but not what should be, and outside of its domain value judgements of all kinds remain necessary.

Solitude is painful when one is young, but delightful when one is more mature.

Go out as far as you can go and start from there

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.

Overemphasis of the competitive system and premature specialization on the ground of immediate usefulness kill the spirit on which all cultural life depends, specialized knowledge included.