Question: Who wrote the title page of the Book of Mormon? What is its message?
Answer: Joseph Smith declared, “The title-page of the Book of Mormon is a literal translation, taken from the very last leaf, on the left hand side of the collection or book of plates.”
The title page states, “The Book of Mormon, an account written by the hand of Mormon upon plates taken from the plates of Nephi.”
“Wherefore it is an abridgment of the record of the people of Nephi, and also of the Lamanites–Written to the Lamanites, who are a remnant of the house of Israel; and also to Jew and Gentile–Written by way of commandment, and also by the spirit of prophecy and of revelation–Written and sealed up, and hid up unto the Lord, that they might not be destroyed–To come forth by the gift and power of God unto the interpretation thereof–Sealed by the hand of Moroni, and hid up unto the Lord, to come forth in due time by way of the Gentile–The interpretation thereof by the gift of God.”
Mormon states three reasons he included the Book of Ether:
(1) Which is to show unto the remnant of the House of Israel what great things the Lord hath done for their fathers;
(2) and that they may know the covenants of the Lord, that they are not cast off forever–
(3) And also to the convincing of the Jew and Gentile that JESUS is the CHRIST, the ETERNAL GOD, manifesting himself unto all nations.
Source: 400 Questions and Answers About the Book of Mormon by Susan Easton Black, p 47.