"Many of Aristotle's observations--especially the scientific ones about, for instance, the movements of celestial bodies and about procreation as the sole purpose of human sexuality--have not weathered the test of time. (Galileo's trouble with the Catholic hierarchy was caused by his unraveling the Aristotelian cosmology to which the hierarchs had wedded themselves. Everyone's trouble with the Catholic hierarchy in our day is caused by its continued adherence to Aristotelian obserations on human sexuality that everyone else knows are inadequate.)"
--Thomas Cahill, Sailing the Wine-Dark Sea: Why the Greeks Matter, page 188