The Key: The Book of Mormon

I was sitting in a mission meeting. We were talking about why The Book of Mormon is so important and how we can teach better by using the Book of Mormon. I thought about it for a minute and then raised my hand and commented: This information, this good news of the Gospel that we bear is not something we share just for fun. This isn't something that we offer to teach people because we find it humorous or simply because we have nothing better to do. We do it because it is necessary. It is essential for each of us and for each of the people that we come into contact with, each of God's children, to understand His plan for them and to accept Christ's restored Gospel. The Book of Mormon is how they will come to know that the Gospel is true.
In 2 Nephi 3:12 it says, "...that which shall be written by the fruit of thy loins, (The Book of Mormon) and also that which shall be written by the fruit of the loins of Judah, (The Bible) shall grow together, unto the confounding of false doctrine and laying down of contentions, and establishing peace among the fruit of thy loins, and bringing them to the knowledge of their fathers in the latter days, and also to the knowledge of my covenants, saith the Lord."
The Bible and Book of Mormon together confound false doctrine. These two books go hand in hand and because The Book of Mormon contains the fulness of the Gospel, it clarifies many parts in the Bible that are vague or unclear because of the plain and precious parts that were taken out of the Bible over hundreds of years.
The Book of Mormon, when read, understood, and applied into our lives, will lead to a greater measure of peace. It leads to a greater understanding of our purpose here on this earth. It also helps us to understand that God did reveal His Gospel to His children in the Americas, proving that He is "the same yesterday, today and forever" (2 Nephi 27:23) and that He loves His children no matter where they are in the world. The Book of Mormon also lays out very plainly the teachings of Jesus Christ and the things that we must do in order to return to live in the presence of God, namely: have faith in Christ, repent of our sins, be baptized by someone holding the priesthood authority of God, receive the gift of the Holy Ghost, and endure to the end faithfully.

The Book of Mormon "is to show...that Jesus is the Christ, the Eternal God, manifesting himself unto all nations." (Title page of The Book of Mormon)
The Book of Mormon is a second testament to the divinity of Jesus Christ as the Son of God. Throughout the Bible we are told that "in the mouth of two or three witness shall every word be established." (2 Corinthians 13:1) The Book of Mormon is this second witness to the words of Christ found in the Bible.
It is the word of God and as we read it we are promised that we "will get nearer to God by abiding by its precepts than by any other book." (Joseph Smith) We are also promised that if we will seek to know of its truthfulness, the Holy Spirit will testify to our hearts and our minds that it is true and that it is the word of God. When we know that The Book of Mormon is true, we will also come to know that Jesus Christ is our Savior and Redeemer, that Joseph Smith is his revelator and prophet, and that The Church of Jesus Christ of Latter-Day Saints "is the Lord's kingdom once again established on the earth, preparatory to the second coming of the Messiah." (Introduction to The Book of Mormon)

The Church is true. I found that out through reading and praying about The Book of Mormon. No matter who we are or where we are on our road of life, The Book of Mormon will teach us the things that are essential for salvation.
The Book of Mormon is the key.