Spirit of Yeqon

In the Aeon of the Champion story series, Spirit of Yeqon is a phrase used by angels of Heaven to refer to the post-hoc justification of sinful activity by a sinner, usually with the excuse that it was logical to do (it pleases the mind).

It's a reference to the ranking Earth Watcher angel Yeqon, a senior assistant to Lord Shemyaza who led the group. While Asbeel, his other assistant, encouraged Shemyaza to fall into temptation by appealing to his emotions, Yeqon stripped any resultant guilt from the angel's mind by rationalising the things he did, meaning that progressively, the Earth Watchers fell deeper into temptation as there was no 'guilt mechanism' to prevent them from doing evil.

This ultimately led to the watchers becoming mortal by entering the Fleshing, after which they fell from Heaven for good.