Love, I think, is a much better criterion than lack of difficulty. If you can love what you do, even when it hurts, then you may have more than a hobby. And if you’ve never pushed your talents this far before, if you’ve never tested your skills that much, then you probably haven’t discovered your true vocation. Sometimes, the only way to know the difference between a hobby and a calling is to put yourself through the crucible of painful practice.
