Much experience has taught me to recognize—and to recognize as clearly as I recognize anything—that spirits who are caught up in falsity influence our thinking and thoroughly convince us that falsity is true. We cannot see it any other way, and this results from their aura.
Demons too, who are immersed in evil, influence our will in this way and cause evil to seem utterly good. We cannot feel it any other way, and this again results from their aura.
I have had a thousand opportunities to perceive clearly the influence of each group, to tell who it came from, how angels working for the Lord removed the effects, and many other details besides, which cannot well be listed individually.
From this I could see two things with such certainty that nothing has ever seemed more certain to me. One is where the falsity and evil in us come from. The other is the fact that false assumptions and the desire for evil give rise to these auras that stay with us after physical life has ended and that display themselves so openly.
from Secrets of Heaven, Volume 2, Section 1511