Helaman Ch7

The next section of chapters includes 7-16 and is all about Nephi's prophecies and journeyings including the warnings to the Nephites from God before He smites them with pestilence so they repent. Then we hear about Samuel, the Lamanite, who prophesies to the Nephites. Nephi first goes to the north to preach but is rejected so he prays on a tower for the people calling for repentance.
Nephi comes back from a mission trip from the northlands to Zarahemla because the people there rejected his preachings (v1-3). When he gets back home, he sees how Gadianton robbers now fill the judgement-seat and the people are awfully wicked which mad him pretty sad, so he exclaims that he wishes he was from the time of the first Nephi so he could rejoice at the blessing of being delivered to the promised land (v4-8). He goes on to say that he knows he cant change his station, so he climbs a tower and begins to pray with all his soul to God while people passed by and listened to his mourning for the people because of their wickedness (v9-11).
Some people who heard went and told others so there was a multitude of people by the time Nephi finishes his prayer and he asks why they are all there to hear about how he is sad for the iniquities of this people (v12-15). He then starts to plead with the people to repent and no longer let their souls be taken to everlasting misery, but harken to the voice of the good shepherd and remember the Lord is the one who has delivered them so many times (v16-20). The reason people don't humble themselves is because of pride and desire for worldly riches, but that will only bring misery especially if everyone in the city is wicked (v21-22). The Lord will not strengthen the wicked to fight their enemies, but He will show the wicked His strength by humbling them.
It would be better for people who had not had a previous knowledge of all the truths to die and be judged because they have sinned in ignorance, but for the Nephites that Nephi is talking to, they would be judged harshly (v23-24). Nephi closes his preachings to the gathered Nephites by saying they are in trouble because of their great abomination, pride, and wickedness throughout all the people (v25-27). It is necessary for them to repent or they run the risk of being destroyed off the face of the earth and Nephi knows this because he was sent by God to testify of them (v28-29).