I think the discomfort that some people feel in going to the monkey cages at the zoo is a warning sign.

Because men, compared to male chimps, have such relatively small testicles (large testicles indicate a species where many males mate, one after the other, with the same female), we might guess that promiscuous societies were uncommon in the immediate human past.

A celibate clergy is an especially good idea, because it tends to suppress any hereditary propensity toward fanaticism.

We are all made up of star stuff.

Organic as a dandelion seed, [the ship of our imagination] will carry us to worlds of dreams and worlds of facts

What a marvelous cooperative arrangement - plants and animals each inhaling each other's exhalations, a kind of planet-wide mutual mouth-to-stoma resuscitation, the entire elegant cycle powered by a star 150 million kilometers away.

The vast distances that separate the stars are providential. Beings and worlds are quarantined from one another. The quarantine is lifted only for those with sufficient self-knowledge and judgment to have safely traveled from star to star.