The ancient American Prophet Moroni said that we should study the prophecies of Isaiah because they would all be fulfilled.
Search the prophecies of Isaiah. Behold, I cannot write them. Yea, behold I say unto you, that those saints who have gone before me, who have possessed this land, shall cry, yea, even from the dust will they cry unto the Lord; and as the Lord liveth he will remember the covenant which he hath made with them.
Source: Mormon 8:23; The Book of Mormon: Another Testament of Jesus Christ