A secret society of scholars who dedicated their lives to gathering knowledge of the supernatural, for the purposes of cataloging it as well as hiding it away from an unknowing public. At times they saw themselves as protectors of the world too, but they often caused just as much harm as they did good.

[ His tone isn't scolding here - he's not trying to impress any point on Flynn. To him it's just a statement of fact, and no more. ]

Heaven never paid them much attention until one of their number very nearly worked out how to rid demons of their corruption. We started watching them closely after that.