There is no good and evil, there is only power and those too weak to seek it.
It was important, Dumbledore said, to fight, and fight again, and keep fighting, for only then could evil be kept at bay, though never quite eradicated. . . .
Those who choose not to empathize enable real monsters, for without ever committing an act of outright evil ourselves we collude with it through our apathy.
When you were straight, evil thoughts and memories came pouring up out of the darkness inside you; buzzing black flies clinging to the insides of your skull.
You foul, lying, evil little cockroach!
Her grief was so big and wild it terrified her, like an evil beast that had erupted from under the floorboards.
Hermione: You! You foul, loathsome, evil little cocroach! Ron: Hermione, no! He's no worth it.
What was there to be gained by fighting the most evil wizard who has ever existed?" said Black, with a terrible fury in his face. "Only innocent lives, Peter!" "You don't understand!" whined Pettigrew. "He would have killed me, Sirius!" "THEN YOU SHOULD HAVE DIED!" roared Black. "DIED RATHER THAN BETRAY YOUR FRIENDS, AS WE WOULD HAVE DONE FOR YOU!