For the earth shall be filled with the knowledge of the glory of the Lord - Habakkuk modifies in a degree the words of Isaiah which he embodies, marking that the destruction of Babylon was a stage only toward the coming of those good things which God taught His people to long for, not their very coming. All the world should be then full of the knowledge of the glory of the Lord, not, as yet, wholly of Himself Jerome: “When Babylon shall be overthrown, then shall the power of the might of the Lord be known unto all. So shall the whole earth be filled with the glory of the Lord, as the waters cover the bottom of the sea. This as to the letter. But it is plain, that the Devil also and antichrist, and the perverse teaching of heretics, built a city in blood; i. e, their own Church, with the destruction of those whom they deceive ... But when they fail in the fire (either this fire which is felt, or consumed in the fire of the devil their prince, or burned up with the fire whereof the Lord says, ‘I came to send a fire upon the earth,’ and so brought back from their former course, and doing penitence), the whole earth shall be filled with the glory of the Lord, when, at the preaching of the apostles, their ‘sound shall go out into all the world,’ as waters covering the sea, i. e., all the saltness and bitterness of the world which Satan had rained down and the earth had drunk, the waters of the Lord shall cover, and cause the place of their ancient bitterness not to appear.”
Rup.: “‘For the Spirit of the Lord filled the earth,’ and when He filled it, ‘the earth was filled with the knowledge of the glory of the Lord,’ so that unlearned and ignorant men became wise and eloquent, and earthly became heavenly, yea, they who were earth became heaven, knowing the glory of the Lord, declaring the glory of God, not any how, but as waters cover the sea. Great as must be waters, which would cover the sea, or compared to which the sea were nothing, far greater is the miracle, when the abundance of heavenly wisdom, given to the simple, surpassed the sea, i. e., the wisdom of all mankind.” This verse being already a received image of the spread of the gospel Isaiah 11:9, it would of itself be understood to include this also; but more generally, it declares how upon all the judgments of God, a larger knowledge of Him would follow Cyril: “All things are full of Christ, who is the Glory of the Father; wherefore also He said John 17:4, I have glorified Thee on earth, I have finished the work which Thou gavest me to do.”