“Being right too soon is socially unacceptable.”

“There is no conclusive evidence of life after death, but there is no evidence of any sort against it. Soon enough you will know, so why fret about it?”

“When a place gets crowded enough to require ID’s, social collapse is not far away. It is time to go elsewhere. The best thing about space travel is that it made it possible to go elsewhere.”

“The slickest way in the world to lie is to tell the right amount of truth at the right time-and then shut up.”

“Social responsibility above the level of family, or at most of tribe, requires imagination-- devotion, loyalty, all the higher virtues -- which a man must develop himself; if he has them forced down him, he will vomit them out.”

“Animals can be driven crazy by placing too many in too small a pen. Homo sapiens is the only animal that voluntarily does this to himself.”

“Being a mother is an attitude, not a biological relation.”