I've never wanted to be a witch, but an alchemist, now that's a different matter. To invent this wizard world, I've learned a ridiculous amount about alchemy. Perhaps much of it I'll never use in the books, but I have to know in detail what magic can and cannot do in order to set the parameters and establish the stories' internal logic.
J. K. RowlingYou have to resign yourself to the fact that you waste a lot of trees before you write anything you really like, and that's just the way it is. It's like learning an instrument, you've got to be prepared for hitting wrong notes occasionally, or quite a lot, cause I wrote an awful lot before I wrote anything I was really happy with. And read a lot. Reading really helps. Read anything you can get your hands on.
J. K. RowlingThis liberating discovery enables me to proceed without any fear that I might inadvertently influence you to abandon promising careers in business, law or politics for the giddy delights of becoming a gay wizard.
J. K. RowlingOh please," said Zacharias Smith, rolling his eyes and folding his arms. "I don't think Expelliarmus is exactly going to help us against You-Know-Who, do you?" "I've used it against him," Harry said quietly. "It saved my life last June.
J. K. Rowling