Pastor Efrem's sermon was based around the sixth commandment: Do not murder.
The sermon wasn't so much about the obvious not killing someone, but about valuing life. And probably more so, about knowing who we are. The premise was that we have to have a low view of ourselves to devalue someone else enough to take their life. We forget that we are created in God's image--and so is everyone else we come in contact with.
We may not kill, but we devalue through the way we treat others, the things we say about them, the way we act around them. And Jesus (in Matthew 5) says that this is just as bad as murder. If we could just see the value in each person (including ourselves), the mess of this world would be a little bit less.