c. 220–230 · Origen, On First Principles, Greek text of 3.1 and 4.1 (Philocalia) 4.1.19
And again, there are commandments contained in the Gospel which admit of no doubt whether they are to be observed according to the letter or not; e.g., that which says, “But I say unto you, Whoever is angry with his brother,” and so on. And again, “But I say unto you, Swear not at all.” And in the writings of the apostle the literal sense is to be retained: “Warn them that are unruly, comfort the feeble-minded, support the weak, be patient towards all men;” although it is possible for those ambitious of a deeper meaning to retain the profundities of the wisdom of God, without setting aside the commandment in its literal meaning. The careful (reader), however, will be in doubt as to certain points, being unable to show without long investigation whether this history so deemed literally occurred or not, and whether the literal meaning of this law is to be observed or not. And therefore the exact reader must, in obedience to the Saviour’s injunction to “search the Scriptures,” carefully ascertain in how far the literal meaning is true, and in how far impossible; and so far as he can, trace out, by means of similar statements, the meaning everywhere scattered through Scripture of that which cannot be understood in a literal signification.