The evangelist among the prophets
Isaiah is distinguished among the prophets by the breadth and clarity of his messianic prophecy. Christian tradition reads in his book the foretelling of the virgin birth ("Behold, a virgin shall conceive"), the suffering and rejection of the Messiah, the calling of the nations, and the establishment of a universal Church — themes so explicit that he is honored as a kind of evangelist before the Gospel.
The great book that bears his name opens with the vision of God enthroned amid the Seraphim, an image that has entered the worship of the Church. Its language of comfort, repentance, and redemption has shaped Christian reading of the prophets, and passages of it are appointed for the great feasts of the Lord and the Theotokos.