Many s/f authors use his quotes as epigraphs in their novels. ("The word you are looking for is epigraph. Oxford Dictionary defines the word as: A short quotation or saying at the beginning of a book or chapter, intended to suggest its theme.") This is from the first chapter in *The Endless Frontier* by J.Pournelle: > *"The Earth is just too small and fragile a basket for the human race to keep all its eggs in."* - Robert A. Heinlein, July 20, 1976. From the date of that quote, he must have been addressing an audience celebrating the 7th anniversary of the moon landing back when space exploration was a higher priority than stuffing nigger's mouths with EBT fast food. Back when teaching your son that he could be an astronaut when he grew up was a better idea than teaching him he could be a trans-girl.