It’s very important to educate your hand. Make it achieve a level of high obedience so that it will be able to properly and fully express your ideas. But be very careful of trying to obtain too much perfection, as well as too much speed as an artist. Perfection and speed are dangerous — as are their opposites. When you produce drawings that are too quick or too loose, besides making mistakes, you run the risk of creating an entity without soul or spirit. — Moebius (Jean Giraud)