Working hard is important. But there is something that matters even more, believing in yourself. Think of it this way; every great wizard in history has started out as nothing more than what we are now, students. If they can do it why not us?
Lupin: You know, the very first time I saw you, Harry, I recognized you immediately. Not by your scar, by your eyes - they’re your mother Lily’s. Yes, oh, yes. I knew her. Your mother was there for me at a time when no one else was. Not only was she a singularly gifted witch, she was also an uncommonly kind woman. She had a way of seeing beauty even, and perhaps most specially, when that person could not see it himself.
What are you doing?!