My intellectual development was retarded, as a result of which I began to wonder about space and time only when I had already grown up.

The most important human endeavor is the striving for morality in our actions.

The beauty of it is that we have to content ourselves with the recognition of the miracle, beyond which there is no legitimate way out.

Be a loner. That gives you time to wonder, to search for the truth. Have holy curiosity. Make your life worth living.

On the other hand, the concept owes its meaning and its justification exclusively to the totality of the sense impressions which we associate with it.

Reason is intuition's servant.

Only six men in the world know about relativity. I am not one of them. When I ask them to explain, they confused me.