The commandments, "Do not commit adultery," "Do not murder," "Do not steal," "Do not covet," and whatever other commandment there may be, are summed up in this one rule: "Love your neighbor as yourself." Love does no harm to its neighbor. Therefore love is the fulfillment of the law. - Romans 13:9-10
I was reading this in my devotion today, and a question came to my head. It's fair to say that the law (toward men) is summed up in the command to love your neighbor as yourself, and if you do no harm to your neighbor, you fulfill the law. These commands that Paul lists make sense - Adultery, check. Murder, check. Stealing, check. But coveting? How does an internal desire harm another person, if it hasn't been acted upon yet? I thought coveting by definition was simply an inordinate desire for something you don't have; it's not stealing until you have actually stolen, for example. So where am I wrong on this? How does coveting hurt others?