Ask any athlete who has ever won a championship game if they regret the time and effort they spent developing as a player. In the middle of the season, they may have been frustrated or tired, but when the end result is being a champion, no one wishes they had put in less effort or spent less time practicing.
In Mark 8 Jesus was confronted by a blind man with a pretty direct request: he wanted to see. Jesus touched the man and asked if he saw anything. He could see, but not clearly. Did Jesus make a mistake? Or did He want the man to learn something about the way He works?