Free man is by necessity insecure, thinking man by necessity uncertain.

I think American man unconsciously hates his work very often, because he feels trapped by it... imprisoned by it... because he feels that he is spending most of his energy for something which has no meaning in itself.

Sanity is only that which is within the frame of reference of conventional thought.

It seems that great minds a hundred years ago saw what would happen today or tomorrow, while we to whom it is happening blind ourselves in order not to be disturbed in our daily routine.

Only in being productively active can man make sense of his life.

Man represses the irrational passions of destructiveness, hate, envy, revenge; he worships power, money, the sovereign state, the nation; while he pays lip service to the teachings of the great spiritual leaders of the human race, those of Buddha, the prophets, Socrates, Jesus, Mohammed-he has transformed these teachings into a jungle of superstition and idol-worship. How can mankind save itself from destroying itself by this discrepancy between intellectual-technical overmaturity and emotional backwardness?

Ideas become powerful only if they appear in the flesh; an idea which does not lead to action by the individual and by groups remains at best a paragraph or a footnote in a book.