The Doctrine of Joy was a Sidhe edict near the final days of the Shattering that claimed Glamour was fading because the fae (particularly the Nockers) weren't following the old ways from the Time of Legends. As the Nockers tell it, the sidhe wanted all the other kith to dance naked in the fields and kowtow to them like in the "good old days."
References
- CTD. Kithbook: Nockers, pp. 14-15.