The following quote is from an episode of "The Office."
Jim: Sure. Michael's a good teacher. A teacher is someone who stands right next to you your whole life and never lets you do anything. That's what a teacher is, right?
I have seen a few teachers and a lot of parents fall into this trap. As the new school year starts, make sure students are doing their own work. Guide them, but make sure they read the material in their books and study their notes. Make them work through the examples in math. Students should do their own research, work their own math problems, write their own papers, and read their own novels.
The better quote is:
Remember, you can watch hundreds of guitar players, but until you practice the instrument yourself, you'll never be able to play the guitar. You can watch dozens of tennis matches, but until you learn to serve the ball yourself, you'll never be a tennis player.