12 You bring forward arguments against us, and speculative quibblings, which— may I say this without displeasing Him— if Christ Himself were to use in the gatherings of the nations, who would assent? Who would listen? Who would say that He decided anything clearly? Or who, though he were rash and utterly credulous, would follow Him when pouring forth vain and baseless statements? His virtues have been made manifest to you, and that unheard-of power over things, whether that which was openly exercised by Him or that which was used over the whole world by those who proclaimed Him: it has subdued the fires of passion, and caused races, and peoples, and nations most diverse in character to hasten with one accord to accept the same faith.
For the deeds can be reckoned up and numbered which have been done in India, among the Seres, Persians, and Medes; in Arabia, Egypt, in Asia, Syria; among the Galatians, Parthians, Phrygians; in Achaia, Macedonia, Epirus; in all islands and provinces on which the rising and setting sun shines; in Rome herself, finally, the mistress of the world, in which, although men are busied with the practices introduced by king Numa, and the superstitious observances of antiquity, they have nevertheless hastened to give up their fathers' mode of life, and attach themselves to Christian truth.
For they had seen the chariot of Simon Magus, and his fiery car, blown into pieces by the mouth of Peter, and vanish when Christ was named. They had seen him, I say, trusting in false gods, and abandoned by them in their terror, borne down headlong by his own weight, lie prostrate with his legs broken; and then, when he had been carried to Brunda, worn out with anguish and shame, again cast himself down from the roof of a very lofty house. But all these deeds you neither know nor have wished to know, nor did you ever consider that they were of the utmost importance to you; and while you trust your own judgments, and term that wisdom which is overweening conceit, you have given to deceivers— to those guilty ones, I say, whose interest it is that the Christian name be degraded— an opportunity of raising clouds of darkness, and concealing truths of so much importance; of robbing you of faith, and putting scorn in its place, in order that, as they already feel that an end such as they deserve threatens them, they might excite in you also a feeling through which you should run into danger, and be deprived of the divine mercy.
Source: Against the Heathen (New Advent)