Together with the Bible, The Book of Mormon is the inspired Word of God, a record of God's dealings with the ancient inhabitants of the Americas. From the title page, it is "to the convincing of the Jew and Gentile that Jesus is the Christ, the Eternal God, manifesting himself unto all nations" Further on here is a link to read the promise of the Book of Mormon online now.
Prophets were told by God what to include in the book for us in our day. Moroni says "Behold, I speak unto you as if ye were present, and yet ye are not. But behold, Jesus Christ hath shown you unto me, and I know your doing."
For God to know what we would need to know in our day makes the Book of Mormon a priceless gift. May we read it prayerfully as we read the Bible.
If you want to find out for yourself, you can read the promise of the Book of Mormon online now athttp://bit.ly/10t8QYm or request a free copy athttp://bit.ly/11WKJ1G
I know it to be the Word of God. It is true, and in its pages are the words of Christ. Mike - LDS Principles