VII. The knowledge of God shall prevail among them, v. 21. 1. They shall have the means of knowledge. For many ages in Judah only was God known, for there only were the lively oracles found; but now the Lord, and his name and will, shall be known to Egypt. Perhaps this may in part refer to the translation of the Old Testament out of Hebrew into Greek by the LXX., which was done at Alexandria in Egypt, by the command of Ptolemy king of Egypt; and it was the first time that the scriptures were translated into any other language. By the help of this (the Grecian monarchy having introduced their language into that country) the Lord was known to Egypt, and a happy omen and means it was of his being further known. 2. They shall have grace to improve those means. It is promised not only that the Lord shall be known to Egypt, but that the Egyptians shall know the Lord; they shall receive and entertain the light granted to them, and shall submit themselves to the power of it. The Lord is known to our nation, and yet I fear there are many of our nation that do not know the Lord. But the promise of the new covenant is that all shall know the Lord, from the least even to the greatest, which promise is sure to all the seed. The effect of this knowledge of God is that they shall vow a vow to the Lord and perform it. For those do not know God aright who either are not willing to come under binding obligations to the Lord or do not make good those obligations.