There came, then, although Celsus may not wish to admit it, after the numerous prophets who were the reformers of that well-known Israel, the Christ, the Reformer of the whole world, who did not need to employ against men whips, and chains, and tortures, as was the case under the former economy. For when the sower went forth to sow, the doctrine sufficed to sow the word everywhere. But if there is a time coming which will necessarily circumscribe the duration of the world, by reason of its having had a beginning, and if there is to be an end to the world, and after the end a just judgment of all things, it will be incumbent on him who treats the declarations of the Gospels philosophically, to establish these doctrines by arguments of all kinds, not only derived directly from the sacred Scriptures, but also by inferences deducible from them; while the more numerous and simpler class of believers, and those who are unable to comprehend the many varied aspects of the divine wisdom, must entrust themselves to God, and to the Saviour of our race, and be contented with His “ipse dixit,” instead of this or any other demonstration whatever.
Source: Against Celsus (New Advent)