The woman who follows the crowd will usually believe that I said this.

Chess holds its master in its own bonds, shackling the mind and brain so that the inner freedom of the very strongest must suffer.

We come now to the question: what is a priori certain or necessary, respectively in geometry (doctrine of space) or its foundations? Formerly we thought everything; nowadays we think nothing. Already the distance-concept is logically arbitrary; there need be no things that correspond to it, even approximately.

The individual who has experienced solitude will not easily become a victim of mass suggestion.

What I see in Nature is a grand design that we can understand only imperfectly, one with which a responsible person must look at with humility.

Morality is of the highest importance - but for us, not for God.

In the middle of difficulties lie opportunities.