“Authority figures always attract trouble.”

“What must strike any intelligent witch or wizard on studying the so-called history of the Elder Wand is that every man who claims to have owned it has insisted that it is "unbeatable," when the known facts of its passage through many owners' hands demonstrate that has it not only been beaten hundreds of times, but that it also attracts trouble as Grumble the Grubby Goat attracted flies.”

“Promise me you’ll look after yourself … stay out of trouble …’‘I always do, Mrs Weasley,’ said Harry. ‘I like a quiet life, you know me.”

“Magic causes as much trouble as it cures.”

“The trouble is, the other side can do magic too, Prime Minister.”

“The trouble is, humans do have a knack of choosing precisely those things that are worst for them.”

“Well, you can't break an unbreakable vow," said Ron."I figured that out myself, funnily enough.”