Section 20

The church was established legally April 6, 1830.  The Book of Mormon proves the truth of the scriptures and the church. Joseph Smith was a prophet. There is no way to dismiss the Book of Mormon.  It is amazing, deep in doctrine, full of nuances and varied voices from the ancient Americas.  Prophets then and now affirm that God lives and Jesus is our Savior.
Through the grace of Christ we can be forgiven of sin immediately, today, as needed, by way of repentance.  This is justification.  We are covered in the short run by his Atonement.  Also, we are covered in the long run, line upon line, a little at a time until we are completely clean.  This is sanctification.  We are sanctified by Christ through the Holy Ghost.
If we listen to and obey the voice of the Spirit we will born again and eventually have no desire to sin.