The Power of Knowledge
Season 6. Crowley believes in being prepared for everything
Crowley grabbed the old leather book and felt the embossed letters with his fingertips.
Whatever would happen in the future, the King of Hell was aware that his alliance with Castiel was only a temporary partnership. He was a demon, Castiel was an angel, it was inevitable in the long run. He hadn't gotten to the point he was now or even to his former vocation as King of the Crossroads by not preparing himself for every eventuality. Whoever talked of backstabbing environment had hell in mind. Perhaps he wouldn't need this after all, but he wanted to be prepared.
It had taken careful maneuvering and friends in low places to get him what he needed. A real and exhaustive book about the Enochian language, not just the grammar school version the humans had. Crowley's face widened in triumph and he leaned back in his chair in his opulent corner office of hell. Here he had all the time he needed to learn.