17 We may say the very same things of the Mercuries, the Suns,— indeed of all the others whose numbers you increase and multiply. But it is sufficient to know from one case that the same principle applies to the rest; and, lest our prolixity should chance to weary our audience, we shall cease to deal with individuals, lest, while we accuse you of excess, we also should ourselves be exposed to the charge of excessive loquacity. What do you say, you who, by the fear of bodily tortures, urge us to worship the gods, and constrain us to undertake the service of your deities? We can be easily won, if only something befitting the conception of so great a race be shown to us. Show us Mercury, but only, one; give us Bacchus, but only one; one Venus, and in like manner one Diana. For you will never make us believe that there are four Apollos, or three Jupiters, not even if you were to call Jove himself as witness, or make the Pythian god your authority.
Source: Against the Heathen (New Advent)