Isaiah 7:10

(Verse 10, 11.) And the Lord added, speaking to Achaz, saying: Ask for yourself a sign from the Lord your God in the depths of hell, or in the highest above. He had previously spoken to Achaz through the prophet, saying: Behold, be silent, do not fear, and so on. Since Achaz did not believe, and therefore did not understand, the Lord himself speaks to Achaz, so that at least, frightened by the authority of the Lord, he may accept what is said. For, he says to him, it seems difficult to you that the most powerful kingdoms are to be ended in a short time, and that you will be delivered from great danger along with your people; ask for yourself a sign, not from idols, by whose error you are held captive, but from the Lord your God who promises you help, and that sign is the basis of your request, whether from the depths or from on high. But while only the Seventy interpreted it as 'from the depth of hell,' the others translated it more significantly according to the Hebrew, 'from the depth of the underworld.' Therefore, just as 'the depths of hell' signifies a profound abyss, so we should understand 'the heights above the heavens' as an exalted state. So when you hear a sign about either the underworld or the exalted, believe in the future things that I have mentioned. Do you want, he says, the earth to be split open and the great chasms of the underworld to be revealed, which are said to exist in the heart of the earth, or for the heavens to be opened? Both pertain to the mystery of the death and ascension of the Lord: For he who descended is the one who also ascended (Ephesians 4:10). And in the Apostle we read: 'Don't say in your heart, "Who will ascend into heaven?" (that is, to bring Christ down)' or 'Who will descend into the abyss?' (that is, to bring Christ up from the dead)' (Romans 10:6-7). […]

And the Lord spoke again to Achaz. Here the sign of liberation is set out. And first, the liberty to choose a sign is given; second, the sign for believing is conferred: therefore the Lord himself shall give (Isa 7:14). Concerning the first, three things …

Moreover the Lord spake again unto Ahaz,.... By the prophet Isaiah: saying; as follows:

A threatening of the great desolation that God would bring upon Ahaz and his kingdom by the Assyrians, notwithstanding their escape from this present storm, because they went on still in their wickedness,

He considers our frame, and that, living in a world of sense, we are apt to require sensible proofs, which therefore he has favoured us with in sacramental signs and seals. Ahaz was a bad man, yet God is called the Lord his God, because he was a child of Abraham and David, and of the covenants made with them.