The Histories · 3.38

It is clear to me therefore by every kind of proof that Cambyses was mad exceedingly; for otherwise he would not have attempted to deride religious rites and customary observances. For if one should propose to all men a choice, bidding them select the best customs from all the customs that there are, each race of men, after examining them all, would select those of his own people; thus all think that their own customs are by far the best: and so it is not likely that any but a madman would make a jest of such things. Now of the fact that all men are thus wont to think about their customs, we may judge by many other proofs and more specially by this which follows:—Dareios in the course of his reign summoned those of the Hellenes who were present in his land, and asked them for what price they would consent to eat up their fathers when they died; and they answered that for no price would…

Herodotus of Halicarnassus · trans. G. C. Macaulay, 1890
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