6 But, besides this, those very Jews who then disputed with the Lord Jesus Christ have most clearly indicated the same thing. For when the Lord said to them, “Your father Abraham rejoiced to see My day; and he saw it, and was glad,” they answered Him, “You are not yet fifty years old, and have You seen Abraham?” Now, such language is fittingly applied to one who has already passed the age of forty, without having as yet reached his fiftieth year, yet is not far from this latter period. But to one who is only thirty years old it would unquestionably be said, “You are not yet forty years old.” For those who wished to convict Him of falsehood would certainly not extend the number of His years far beyond the age which they saw He had attained; but they mentioned a period near His real age, whether they had truly ascertained this out of the entry in the public register, or simply made a conjecture from what they observed that He was above forty years old, and that He certainly was not one of only thirty years of age. For it is altogether unreasonable to suppose that they were mistaken by twenty years, when they wished to prove Him younger than the times of Abraham. For what they saw, that they also expressed; and He whom they beheld was not a mere phantasm, but an actual being of flesh and blood. He did not then want much of being fifty years old; and, in accordance with that fact, they said to Him, “You are not yet fifty years old, and have You seen Abraham?” He did not therefore preach only for one year, nor did He suffer in the twelfth month of the year. For the period included between the thirtieth and the fiftieth year can never be regarded as one year, unless indeed, among their Æons, there be so long years assigned to those who sit in their ranks with Bythus in the Pleroma; of which beings Homer the poet, too, has spoken, doubtless being inspired by the Mother of their [system of] error:—
Οἱ δὲ θεοὶ πὰρ Ζηνὶ καθήμενοι ἠγορόωντο
Χρυσέῳ ἐν δαπέδῳ:
which we may thus render:
“The gods sat round, while Jove presided o'er,
And converse held upon the golden floor.”
Source: Adversus haereses (New Advent)