68 On the Alban hill, it was not allowed in ancient times to sacrifice any but snow-white bulls: have you not changed that custom and religious observance, and has it not been enacted by decree of the senate, that reddish ones may be offered? While during the reigns of Romulus and Pompilius the inner parts, having been quite thoroughly cooked and softened, were burnt up in sacrificing to the gods, did you not begin, under king Tullius, to hold them out half-raw and slightly warm, paying no regard to the former usage?
While before the arrival of Hercules in Italy supplication was made to father Dis and Saturn with the heads of men by Apollo's advice; have you not, in like manner, changed this custom too, by means of cunning deceit and ambiguous names? Since, then, yourselves also have followed at one time these customs, at another different laws, and have repudiated and rejected many things on either perceiving your mistakes or seeing something better, what have we done contrary to common sense and the discretion all men have, if we have chosen what is greater and more certain, and have not suffered ourselves to be held back by unreasoning respect for impostures?
Source: Against the Heathen (New Advent)