The communal life of human beings had . . . a two-fold foundation: the compulsion to work, which was created by external necessity, and the power of love.

I have often felt as though I had inherited all the defiance and all the passions with which our ancestors defended their Temple and could gladly sacrifice my life for one great moment in history. And at the same time I always felt so helpless and incapable of expressing these ardent passions even by a word or a poem.

Not all men are worthy of love.

Sadism is all right in its place, but it should be directed to proper ends.

One day, in retrospect, the years of struggle will strike you as the most beautiful.

Men have gained control over the forces of nature to such an extent that with their help they would have no difficulty exterminating one another to the last man. They know this, and hence comes a large part of their current unrest, their unhappiness and their mood of anxiety.

Out of your vulnerabilities will come your strength.