Isaiah 45-18-25 describes some of the key works of Yahweh God, as well has some of his personal characteristics. When we turn to the New Testament we see these same works performed by the Lord Jesus. In fact, in John 12-36-41, the author, the Apostle John, states that Yahweh, whom Isaiah saw high and lifted up in the temple, was actually Christ himself. So we have to conclude that Jesus Christ our Lord was Yahweh who had come in our flesh to rescue and redeem us to himself. This was I believe, a literal fulfillment of Isaiah 40-9-11-- -Say to the towns of Judah,- -Here is your God---Christ came to his people in the first century and we can be assured he will keep his Word to return on the Last Day to bring us fully to himself. In His presence will be fullness of joy.