The critics claim to have discovered, on literary and other evidence, that the Church of Christ, in all its branches, has been mistaken in all the past concerning the author of the book known as the Prophecies of Isaiah. They assume that all the foremost scholars of the world, and the faith of God's people, have been misled. Our critical advisers profess to have discovered that there were at least two, and probably many more prophets, whose writings compose the book. They refuse to recognize Isaiah alone as the author; and for several reasons: _First_--Because of the change of style of composition from the thirty-ninth chapter to the close of the book. _Second_--On the ground that the theme is more exalted than in the first thirty-nine chapters. Hence, it is assumed that these last chapters could not have been written by Isaiah. _Third_--On the ground that Cyrus is mentioned by name, in the forty-fourth and forty-fifth chapters of the book, as the restorer of Jerusalem. Hence, our critics conclude that this part of the book must have been written after the event, as the prophet (it is assumed) could not name Cyrus before his birth. _Fourth_--The critics assume that the prophet must prophesy out of his immediate surroundings, whatever that may mean. They furnish their troubled disciples the comforting assurance that these discoveries do not diminish the value of the book, but render it more accurate and interesting as a literary work. The professor already quoted, a fair representative of the critical school, in his recent lectures, referred to on a preceding page, distinguished the authors of the book as "Isaiah and the Great Unknown Prophet." Other critics multiply, somewhat indefinitely, the number of "The Unknowns." Our critic regards the change in _style and theme_ from the thirty-ninth chapter to the end of the book as valid proof of at least the dual authorship of the book. This assumption instantly raises the question as to who is the author of prophetic themes. Is it the prophet himself or the Holy Spirit? Does the prophet himself bring forth the prophecy of his own foreknowledge? Or, is the Holy Spirit the inspirer of themes new and old? Happily God has settled the question for us. He declares by his Apostle Peter "that no prophecy of Scripture is of any private interpretation"; that is, of the prophet's own disclosure. "For prophecy came not of old time by the will of man; but _holy men of God spake as they were moved by the Holy Spirit_." (2 Peter i. 20, 21.) It is, therefore, bold assumption to affirm that God could not give to the same prophet new and more exalted themes in his progressive revelation of truth. It is a limitation of God himself to the critic's notion of what should, or should not be. This would eliminate the divine element of the book by a sweep of the critic's pen. It is an assumption too groundless to need a reply.