The Book of Isaiah is one of the Major Prophets in the Old Testament. Jews and Christians consider the Book of Isaiah a part of their Biblical canon. Christians believe that Isaiah prophesied the virgin birth of Jesus Christ (Isaiah 7:14, KJV): "Behold, a virgin shall conceive, and bear a son, and shall call his name Immanuel." Many of the New Testament teachings of Jesus refer to the book of Isaiah.
Gregory of Nyssa (c. 335-395), believes that the Prophet Esaias (Isaiah) "knew more perfectly than all others the mystery of the religion of the Gospel." Jerome (c. 342-420) also lauds the Prophet Esias, saying, "He was more of an Evangelist than a Prophet, because he described all of the Mysteries of the Church of Christ so vividly that you would assume he was not prophesying about the future, but rather was composing a history of past events." (Introduction from Wikipedia)
