Alma Chapter 12

12:5 - "...Now this was a plan of thine adversary, and he hath exercised his power in thee..."
Alma, while "chastising" and calling Zeezrom to repentance, shows Zeezrom that his plan to catch Alma in his words was actually a plan of Satan.
I find it interesting because Alma says to Zeezrom, "this was a plan of thine adversary."
Alma didn't say that Zeezrom was a follower of Satan, but rather that Satan was Zeezrom's adversary, too.  It's important to remember this for all people...that even if we think they are following Satan, they are still adversaries with him.  We just need to help them remember this, and as they remember true doctrine, and come to understand it better, they will change their behavior - just as we should change our own ways to match God's commandments and example.


12:8-18 - "...What does this mean which Amulek hath spoken concerning the resurrection of the dead..."
A good way to see why a certain message is given is to look for any questions that were asked, which inspire the message.
In this case, Zeezrom asks, "What does this mean which Amulek hath spoken concerning the resurrection of the dead, that all shall rise from the dead, both the just and the unjust, and are brought to stand before God to be judged according to their works?"
Good question.
Good person to ask the question to, too.
Alma explains that the more that we accept and receive, the more that the Lord gives us, until we are cut off or know the mysteries in full, depending if we accept or reject what the Lord gives us.  Then we will stand before God and be condemned or justified by our works, words, and thoughts.
For these reasons, we need to keep our actions, words, and thoughts pure.  Then we will have confidence before God.


12:30 - "...God conversed with men, and made known unto them the plan of redemption, which had been prepared from the foundation of the world; and this he made known unto them according to their faith and repentance and their holy works..."
We receive more as we act in faith on what we already have.  If we don't act in faith, it is taken away from us.  We need to do our best to be moving forward, acting in faith, and learning more so we can improve.