Alma 24

10 And I also thank my God, yea, my great God, that he hath granted unto us that we might repent of these things, and also that he hath forgiven us of those our many sins and murders which we have committed, and taken away the guilt from our hearts, through the merits of his Son.
11 And now behold, my brethren, since it has been all that we could do, (as we were the most lost of all mankind) to repent of all our sins and the many murders which we have committed, and to get God to take them away from our hearts, for it was all we could do to repent sufficiently before God that he would take away our stain

Forgiveness and release from guilt are perhaps the greatest manifestations of the love of God in our lives. The Savior's atoning blood pays the price, and those things that plague our conscience and keep us awake at night can be taken away from our hearts. I'm grateful for that peace of mind.

Moroni inserts a comment at the end of chapter 24 that was his conclusion as he abridged more than a thousand years of history. Those who fall away, having once known the truth, just can't leave it alone.

30 And thus we can plainly discern, that after a people have been once enlightened by the Spirit of God, and have had great knowledge of things pertaining to righteousness, and then have fallen away into sin and transgression, they become more hardened, and thus their state becomes worse than though they had never known these things.