There are many stories of people who thought they had either reached the pinnacle of life and were ready to slow down, or who thought they had screwed things up so badly they could never be of use to God or anyone else again. But, God had other plans.
David is a visionary who saw a flaw in the way people were living their lives, and developed a mission to help them alter their trajectory to enjoy happier, more fulfilling lives by helping others around them.