Mosiah 28

As Alma and the Sons of Mosiah repented of their sins, we witness a few more important aspects of true repentance that follow in that -

"...Alma began from this time forward to teach the people, and those who were with Alma at the time the angel appeared unto them, traveling round about through all the land, publishing to all the people the things which they had heard and seen, and preaching the word of God in much tribulation, being greatly persecuted by those who were unbelievers, being smitten by many of them.
33 But notwithstanding all this, they did impart much consolation to the church, confirming their faith, and exhorting them with long-suffering and much travail to keep the commandments of God." (Book of Mormon | Mosiah 27:32 - 33)

"And they traveled throughout all the land of Zarahemla, and among all the people who were under the reign of king Mosiah, zealously striving to repair all the injuries which they had done to the church, confessing all their sins, and publishing all the things which they had seen, and explaining the prophecies and the scriptures to all who desired to hear them.
36 And thus they were instruments in the hands of God in bringing many to the knowledge of the truth, yea, to the knowledge of their Redeemer." (Book of Mormon | Mosiah 27:35 - 36)

Restitution and blessing the lives of others seem to be part of the process as we become "new creatures". Much like Isiah and Abinadi taught of those that become the "Father's seed" -

"...how blessed are they! For they did publish peace; they did publish good tidings of good; and they did declare unto the people that the Lord reigneth." (Book of Mormon | Mosiah 27:37)

So penitent were the Sons of Mosiah that -

"...they were desirous that salvation should be declared to every creature, for they could not bear that any human soul should perish; yea, even the very thoughts that any soul should endure endless torment did cause them to quake and tremble." (Book of Mormon | Mosiah 28:3)

From being the worst of the worst to being the best of the best required a great transition for -

"...the Spirit of the Lord work upon them, for they were the very vilest of sinners. And the Lord saw fit in his infinite mercy to spare them; nevertheless they suffered much anguish of soul because of their iniquities, suffering much and fearing that they should be cast off forever." (Book of Mormon | Mosiah 28:4)