I remember that Fantastic Four story, it was written and drawn by John Byrne. What happened is the boy goes to the hospital with serious burns and and Johnny visits him. When the boy tells Johnny that he did it on purpose cuz he wanted to be like the Human Torch, Johnny has a crisis of faith and vows not to use his powers again. The Beyonder then shows up and gives Johnny a pep talking telling him that being a hero inspires people so he shouldn't give it up. Last page is Johnny not quitting being the Human Torch.