Alma Ch39

Now we move onto Corianton, the third son of Alma. We will be reading the counsels from Alma to his last son for a few chapters because there is a lot to say to his son on the topic of his sins. When they were all on the mission to the Zoramites, Corianton sinned and prevented some from receiving the word of God by being a bad example.
The reason Shiblon only needed one chapter was because he has listened to the words of Alma and kept the commandments diligently unlike Corianton who needs to hear some choice counsels (v1). Both Shiblon and Corianton were on the mission to the Zoramites, but Corianton was boastful and abandoned his mission to chase a girl he liked, Isabel, because she was desirable to many (v2-3). It was still no excuse for Corianton to leave the ministry he was entrusted because by doing this committed one of the more abominable sins in the sight of God (v4-5).
Only denying the Holy Ghost when you know it is real, and murdering are worse than what Corianton did by choosing to lust after Isabel and hinder the work of the Lord (v6-8). Alma is talking about this because he wants to make Corianton realize that he needs to repent and then deny his lusts, but it is hard to do this alone, so Alma tells him to turn to his older brothers for help (v9-10). Any Zoramite who saw Corianton acting wickedly wouldn't believe the words of Alma because they saw hypocrisy among the missionaries; this is a testimony of what great influence our actions have on others (v11).
Alma has been told by the Lord to command his sons to do good because they are an example to the people and have the influence to either lead many into wickedness, or inspire righteousness by turning to the Lord (v12). It would be best for Corianton to return to the Zoramites and testify of the faults he committed while among them and fully repent of his vain ways, which is why Alma suggests it and counsels him not to seek riches of this world (v13-14). The truths of Christ are glad tidings of salvation that should be declared to everyone and Corianton was a part of that work and still should be (v15-16). Some of the words that Alma speaks are hard, but every soul is precious to God and that includes past, present, and future and He wants all to know of the plan of redemption which is why He sends His angels (missionaries) (v17-19).