I, Moroni, am commanded to write these things, that evil may be done away, and that the time may come that Satan may have no power upon the hearts of the children of men, but that they may be persuaded to do good continually, that they may come unto the fountain of all righteousness and be saved.
~ Moroni III:11

So, if folks want to be saved, they must come unto the fountain of all righteousness, by doing good continually, Then will satan have no power upon their hearts, because evil is done away!

Sometimes the correct pattern is not seen, until we finish the chiasm ourselves!