The Earth is just too small and fragile a basket for the human race to keep all its eggs in.
Robert A. HeinleinDelusions are often functional. A mother's opinions about her children's beauty, intelligence, goodness, et cetera ad nauseam, keep her from drowning them at birth.
Robert A. HeinleinIf God existed (a question concerning which Jubal maintained a meticulous intellectual neutrality) and if He desired to be worshiped (a proposition which Jubal found inherently improbable but conceivably possible in the dim light of his own ignorance), then (stipulating affirmatively both the above) it nevertheless seemed wildly unlikely to Jubal to the point of reductio ad absurdum that a God potent to shape galaxies would be titillated and swayed by the whoop-te-do nonsense the Fosterites offered Him as "worship.
Robert A. Heinlein