Jesus lays out a whole process that we might go through in order to resolve differences that we might have with another person. And how we fail to know Jesus presence when we are gathered, because there is too much garbage to distract us. We try to find peace, and we find our minds dwelling on that other person or the hurt we feel in our heart. We wonder if the other misunderstood us, what we meant to say. We recall the bitter words exchanged, and we get angry all over again.
Garbage can get heavy and garbage can stink.
It's interesting that only after giving his directions regarding resolving conflicts and disagreements that Jesus goes on to talking about gathering in his name and knowing his presence. If we were dealing with physical garbage, we would have to make some decisions about what to do with it. So often it's our choice not to do anything directly with the other person. It's our choice to let something go on. Maybe out attempt will not work, but at least we could have the satisfaction that we tried.