Luke 18:8

Irenaeus Against Heresies Book IV

indicated His [second] advent, concerning which He Himself says, "Thinkest thou that when the Son of man cometh, He shall find faith on the earth? "[498]

Cyprian Epistle LXXIII

But if there be among us, most beloved brother, the fear of God, if the maintenance of the faith prevail, if we keep the precepts of Christ, if we guard the incorrupt and inviolate sanctity of His spouse, if the words of the Lord abide in our thoughts and hearts, when he says, "Thinkest thou, when the Son of man cometh, shall He find faith on the earth"[19]

Cyprian Treatise I On the Unity of the Church

And therefore the Lord, looking to our days, says in His Gospel, "When the Son of man cometh, think you that He shall find faith on the earth? "[71]

Constitutions of the Holy Apostles Book VI

For these are hidden wolves, dumb dogs, that cannot bark, who at present are but few, but in process of time, when the end of the world draws nigh, will be more in number and more troublesome, of whom said the Lord, "Will the Son of man, when He comes, find faith on the earth? "[98]

Origen Commentary on John Book VI

as the Saviour Himself uttered an expression of doubt as to those who would witness His coming, saying,[180]

Origen Commentary on Matthew Book XIII

This is manifest from consideration of the saying, "How-beit when the Son of man cometh shall He find faith on the earth? "[10]