37 It is impossible, in a digression like this, to refer, however briefly, to all the figurative predictions of Christ which are to be found in the law and the prophets. Will it be said that these things happened in the regular course of things, and that it is a mere ingenious fancy to make them typical of Christ? Such an objection might come from Jews and Pagans; but those who wish to be considered Christians must yield to the authority of the apostle when he says, "All these things happened to them for an example;" and again, "These things are our examples." For if two men, Ishmael and Isaac, are types of the two covenants, can it be supposed that there is no significance in the vast number of particulars which have no historical or natural value? Suppose we were to see some Hebrew characters written on the wall of a noble building, should we be so foolish as to conclude that, because we cannot understand the characters, they are not intended to be read, and are mere painting, without any meaning? So, whoever with a candid mind reads all these things that are contained in the Old Testament Scriptures, must feel constrained to acknowledge that they have a meaning.
Source: Reply to Faustus the Manichaean (New Advent)