Crowley (An Angel who did not so much Fall as Saunter Vaguely Downwards) - Terry Pratchett

It is important that we know where we come from, because if you do not know where you come from, then you don't know where you are, and if you don't know where you are, you don't know where you're going. And if you don't know where you're going, you're probably going wrong.

It was lonely on the hill, and cold. And all you could do was keep going. You could scream, cry, and stamp your feet, but apart from making you feel warmer, it wouldn’t do any good. You could say it was unfair, and that was true, but the universe didn’t care because it didn’t know what “fair” meant. That was the big problem about being a witch. It was up to you. It was always up to you.

Many people, meeting Aziraphale for the first time, formed three impressions: that he was English, that he was intelligent, and that he was gayer than a treeful of monkeys on nitrous oxide.