Christology of the Old Testament: And a Commentary on the Messianic Predictions. Vol. 2

Isaiah is the principal prophetical figure in the first period of canonical prophetism, i.e., the Assyrian period, just as Jeremiah is in the second, i.e., the Babylonian. With Isaiah are connected in the kingdom of Judah: Joel, Obadiah, and Micah; in the kingdom of Israel: Hosea, Amos, and Jonah.
The name "Isaiah" signifies the "Salvation of the Lord." In this name we have the key-note of his prophecies, just as the name Jeremiah: "The Lord casts down," indicates the nature of his prophecies, in which the prevailing element is entirely of a threatening character. That the proclamation of salvation occupies a very prominent place in Isaiah, was seen even by the Fathers of the Church. Jerome says: "I shall expound Isaiah in such a manner that he shall appear not as a prophet only, but as an Evangelist and an Apostle;" and in another passage: "Isaiah seems to me to have uttered not a prophecy but a Gospel." And Augustine says, De Civ. Dei, 18, c. 29, that, according to the opinion of many, Isaiah, on account of his numerous prophecies of Christ and the Church, deserved the name of an Evangelist rather than that of a Prophet. When, after his conversion, Augustine applied to Ambrose with the question, which among the Sacred Books he should read in preference to all others, he proposed to him Isaiah, "because before all others it was he who had more openly declared the Gospel and the calling of the Gentiles." (Aug. Conf. ix. 5.) With the Fathers of the Church Luther coincides.