Martin Luther defined sin as the turning inward on oneself. I think that’s a pretty good definition. When we turn in on ourselves, we turn away from God and from everyone else. By Luther’s definition, sin is narcissistic in nature, which is pretty fitting actually.
When we talk about sin, we often think of it in terms of individual actions. And those can definitely be sins. We sin when we do certain things to other people. But I wonder if we get the full extent of sin when we limit sin to just some things that we do to other people.