God Is, Lucifer is a devil, and there is a Hell.

Demonic spirits never sleep or take a vacation, always plotting and waiting for the next offensive.

His apprentice was just beginning to grapple with this experience, coming face to face with the sombre realities of their ministry, that there was an entire unseen universe not any less real simply because it was invisible to mortal eyes most of the time. An ancient war was yet raging against enemies that never sleep, always plotting, continually ensnaring, sadistically feeding off destruction, despair and death, physical and eternal, glutted and glutting, never filled, never satisfied.

The devil did not need to work at all when people were so willing to do his dirty work for him.

... a demon cannot be doped.

The phrase 'battling' the principalities and powers took on a whole new aspect, prayer becoming as physical as any piece of steel or iron they could wield against an enemy along with their holy water and crucifixes.