Why is the parable of the 2 lost sons left open-ended?
The Older Brother believed his good works gave him cause to boast
Ephesians 2:8–9 ESV
For by grace you have been saved through faith. And this is not your own doing; it is the gift of God, not a result of works, so that no one may boast.
Self Righteousness robs us of the joy of Salvation
Why is the parable of the 2 lost sons left open-ended?
Because Jesus has given us a pen, and we get to finish the story