“Of course I’ve gone mad with power! Have you ever tried going mad without power? It’s boring and no one listens to you!— Russ Cargill”

“So light a fire!" Harry choked. "Yes...of course...but there's no wood!" ... "HAVE YOU GONE MAD!" Ron bellowed. "ARE YOU A WITCH OR NOT!”

“Gone mad is what they say, and sometimes Run mad, as if mad is a different direction, like west; as if mad is a different house you could step into, or a separate country entirely. But when you go mad you don't go any other place, you stay where you are. And somebody else comes in.”

“If you care about something enough, it’s going to make you cry. But you have to use it. Use your tears. Use your pain. Use your fear. Get mad. Arnold, get mad.”

“If you're ever in doubt, throw a pepper in the air. If it fails to come down, you have gone mad, so don't trust in anything.”

“I have both held and beheld unlimited power and of it I know but one thing. It drives men mad.'- Alexander the Great”