In my (southern) Baptist tradition, preachers don’t generally use the lectionary. If we come up with a decent reflection that’s somewhat related to one recognizable biblical passage, it’s been a good week. But these three passages together pack a powerful punch. They offer insights into the entire sin-alienation-forgiveness process, which is so central to human life and to Christian existence.
The psalmist doesn’t tell us what his “sin” or “transgression” was, just that he literally “wasted away” from its effects in his life. It ate him up. It sapped his strength. As long as he carried this unconfessed sin on his shoulders, he “groan[ed]” under its weight.