Bede the Venerable

John is therefore interpreted, “one in whom is grace, or the grace of God;” by which name it is declared, first, that grace was given to his parents, to whom in their old age a son was to be born; next, to John himself, who was to become great before the Lord; lastly, also to the children of Israel, whom he was to convert to the Lord. Hence it follows, And he shall be a joy unto thee, and a cause of rejoicing.