This Gospel passages mentions the devil, sin and the power of Jesus. It emphesizes the need to avoid sin, and the damage it does to us and others. It talks about the need to be charitable to others and build up the human community. And it talks about receiving our reward. It covers a lot, and so does this homily which is a short summary of The fall of the angels and humans, redemption in Christ, what is sin and how to fight it, what we're called to do in addition to simply avoiding sin, and our eternal reward. If that is not enough, it draws out the lesson of what all this theology matters for us today.