Jon then began to wonder about all the world-changing possibilities that existed. He'd be lying if he said that he hadn't dreamed of ruling the world or something like that. Who wouldn't jump at the chance of something like that?
Thinking that it was a good idea, Jon proceeded to make a world-changing wish, which his grandfather didn't want him to make.
Holding the stone, Jon went ahead and made his world-changing wish: "I wish ..."