I'll explain it. If we didn't think of things being bad or good, there would be no bad or good, only because we have the thought of good and bad, is there the existence of good and bad things, Get it?
Also the question do you believe in God. Both good and bad people believe in him/her/it/whatever-the-hell-else-god-could-be. Good and bad things have been done in Gods name. And I don't feel like explaining the quote lol