Jacob 3

Jacob is continuing his preaching from the previous chapter and speaks to the pure in heart a little. He also tells the people that the Lamanites have become more righteous! The people have committed some bad sins and Jacob points them out which is why they are more wicked.

The positive side to all he has been commanded to preach by The Lord is what he says to the pure in heart in v1-2. They will be consoled when they pray and protected as long as they receive the pleasing word of God and have firm minds forever. Long lived uplifting talk, those who aren't pure in heart are cursing the land and are more wicked than the Lamanites who will eventually be the one left with the inheritance (v3-4). Even though the Lamanites are wicked in some ways, they have kept covenants of having and loving only one wife and will be blessed for it in the end (v5-7). 

The Lamanites and Nephites have hatred for each other because of the traditions of their fathers (v7). Nephi was righteous and The Lord cursed and marked thee decendents of Laman and Lemuel because of their wickedness. The Nephites are white while the Lamanites are what I would imagine dark brown like the Native Americans (they are their decendents). 

I tell you this because v8 speaks of whiter skin marking who is more righteous. Jacob uses this to tell the people to not hate them because of their filthiness but try to not be filthy themselves (v9-10). As they were encouraged by Jacob, I encourage you to focus on your own faults instead of hate others for theirs. Wake up and be aware of the devils ploy to acquire your soul (v11).

There are many more words Jacob uses to warn the people of every kind of sin and the consequences of them (v12). I assume he doesn't write it because it is repetitive and already covered by Nephi...the actual history of the Nephites is recorded on the other larger plates of Nephi. They contain wars and contentions and all the kings (v13-14).