The danger of the past was that men became slaves. The danger of the future is that men may become robots. True enough, robots do not rebel. But given man's nature, robots cannot live and remain sane, they become ''Golems',' they will destroy their world and themselves because they cannot stand any longer the boredom of a meaningless life.

Technical Utopias-flying, for example-have been achieved by the new science of nature.The human utopia...a united new humankind living in solidarity and peace, free from economic determination and from war and class struggle-can be achieved, provided we spend the same energy, intelligence, and enthusiasm on the realization of the human Utopia as we have spent on the realization of our technical Utopias.

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.

Exclusive love is a contradiction in itself.

A person who has not been completely alienated, who has remained sensitive and able to feel, who has not lost the sense of dignity, who is not yet 'for sale', who can still suffer over the suffering of others, who has not acquired fully the having mode of existence - briefly, a person who has remained a person and not become a thing - cannot help feeling lonely, powerless, isolated in present-day society.

Love isn't something natural. Rather it requires discipline, concentration, patience, faith, and the overcoming of narcissism. It isn't a feeling, it is a practice.

Our vitality, and the vitality of each nation, rests on the sincerity and depth of the faith in the ideas which it announces, or pronounces.