The way I see it is a plea from the rev to his mother to come back. I heard somewhere that the rev wrote this song, and I did a little research and found out that the revs behaviour as a child and a teenager were rather. "abnormal". I feel that hes admitting his guilt and begging her to come back. That's just me haha.
And if the information I heard is false, then I'm sorry for sounding like a complete idiot: P