What shall we do, then? How shall we ascend unto heaven? There, powers are stationed, principalities drawn up in order, who keep the doors of heaven, and challenge him who ascends. Who shall give me passage, unless I proclaim that Christ is Almighty? The gates are shut,—”they are not opened to any and every one; not every one who will shall enter, unless he also believes according to the true Faith. The Sovereign’s court is kept under guard.

Suppose, however, that one who is unworthy has crept up, has stolen past the principalities who keep the gates of heaven, has sat down at the supper of the Lord; when the Lord of the banquet enters, and sees one not clad in the wedding garment of the Faith, He will cast him into outer darkness, where is weeping and gnashing of teeth, if he keep not the Faith and peace.

Let us, therefore, keep the wedding garment which we have received, and not deny Christ that which is His own, Whose omnipotence angels announce, prophets foretel, apostles witness to, even as we have already shown above. — Book IV, Chapter 2