(Lv 19; 1Cor 3:16-23; Mt 5:38-48
There are others who do the right thing and keep the commandments in order to look good; in order for people to think well of them. The Pharisees were like that. They are not truly good people, they just look good. Inside, they are insincere and hypocrites. This is also not the pathway for Christians, as Jesus made clear throughout the Gospel; he hated hypocrisy and self-righteousness.
Many Christians think they are really holy when they come to this level. They want to please you, they want to please God. But it is not enough, it is not the pathway that Jesus teaches in the Sermon on the Mount. He calls us to “Be perfect, just as your heavenly Father is perfect.”
And God is Good, not because He actually wants to do something else but does good to stay out of difficulty. God is Good, not to look Good and solicit praise and admiration. God is Good, not because He wants something in return. God is Good unconditionally, because that is Who He Is.
It is to this same genuine goodness that we are called: sincere, honest, humble, natural, simple, true goodness. Goodness whether others like it or not; Goodness whether there are laws or not; Goodness whether it will get us ahead or whether it will bring us envy and hatred. We will be good, simply because that is who we are, children of God, people who belong to God, followers of Christ.
When you belong to God, and have Him, and are rooted in goodness, you have that which cannot be stolen, robbed, harmed, or taken away, unless you yourself compromise it. You have a freedom which others do not, who have to use violence and deceit to get what they want. Jesus is saying that some battles are not worth fighting, because they will detract from true goodness, and drag us down into a worldliness that is not befitting the children of God. Some battles will endanger our peace and joy, and these are not worth it.
If someone steals your tunic, give them your cloak as well! In other words, there are spiritual realities that are much more important than these things. Most people cling too much to the world, to the flesh, to possessions, to their own sense of self-importance. Most people are way too easily offended when someone strikes at them, dares to criticize them, or hurl an insult against them. Jesus says, don’t worry about it. You have God’s grace, what more do you want?