In the second half of Matthew 5, as the Sermon on the Mount continues, Jesus tells His disciples very plainly that they must take the law of God seriously. It doesn't matter who teaches you how to get around it, or how they teach you to get around it, you aren't to get around it. And further, you are to apply it to a high standard. While the commandment said, "Thou Shalt Not Kill," Jesus says that not killing a brother isn't enough. You aren't to oppress, demean or insult him. Rather, you are to take the initiative to make peace.