Love is the invention of a few high cultures ... it is cultural artifact. To make love the requirement of a lifelong marriage is exceedingly difficult, and only a few people can achieve it. I don't believe in setting universal standards that a large proportion of people can't reach.

Monogamous heterosexual love is probably one of the most difficult, complex and demanding of human relationships.

Motherhood is a biological fact, while fatherhood is a social invention.

You just have to learn not to care about the dusty mites under the beds.

The semimetaphysical problems of the individual and society, of egoism and altruism, of freedom and determinism, either disappear or remain in the form of different phases in the organization of a consciousness that is fundamentally social.

Many people are shrinking from the future and from participation in the movement toward a new, expanded reality. And, like homesick travelers abroad, they are focusing their anxieties on home. The reasons are not far to seek. We are at a turning point in human history. . . . We could turn our attention to the problems that going to the Moon certainly will not solve ... But I think this would be fatal to our future. . . . A society that no longer moves forward does not merely stagnate; it begins to die.

Between friends there is no bribery. ... the relationship of friends is intrinsically fair and equal. Neither feels stronger or more clever or more beautiful than the other.