"I early learned that there were two natures in me. This caused me a great deal of trouble, till I worked out a philosophy of life and struck a compromise between the flesh and the spirit. Too great an ascendancy of either was to be abnormal, and since normality is almost a fetish of mine, I finally succeeded in balancing both natures. Ordinarily they are at equilibrium; yet as frequently as one is permitted to run rampant, so is the other. I have small regard for an utter brute or for an utter saint."

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Our ancestors, when about to build a town or an army post, sacrificed some of the cattle that were wont to feed on the site proposed and examined their livers. If the livers of the first victims were dark-coloured or abnormal, they sacrificed others, to see whether the fault was due to disease or their food. They never began to build defensive works in a place until after they had made many such trials and satisfied themselves that good water and food had made the liver sound and firm, healthfulness being their chief object.

— Marcus Vitruvius Pollio