Your five-year-old child grew up normally under your care. When he turned 25 he realized he was desperately unhappy and begged God for a second chance at life. God obliged and put him back in his five-year-old body with all the knowledge he had as an adult. To you, it looks like your kid was a normal five-year-old yesterday, but today he's a lot more cynical and knows calculus. What do you do with him?
Edit: edited question for clarity.