Who is already a Child of God? A Christian...that's who.
Who ALREADY has an inheritance with God....non-Christians or Christians? Again the answer is "Christian."
These Christians....both of them....were misled by the carnal nature that still lived within them. One was led off into sensual indulgence. The other dwelt in bitterness.
What did each do regarding the carnal nature? What did the Father do with either of them?
The sensually indulgent one came to his senses...a picture of a true believer "recalling" the heavenly gift...and went back home to the Father.
Wonder what happened to the bitter, self-righteous church member? I mean, he didn't lose his sonship, but I wonder what happened?