17. Spirits retain all the perceptions they had while on earth, but to a higher degree because their faculties are no longer deadened by matter. They experience sensations unknown to us; they see and hear things that our limited senses do not enable us to see or hear. For them there is no darkness, except for those whose punishment requires them to be in darkness temporarily. All our thoughts reverberate within them and they can read them like an open book. What we may be able to hide from a living person cannot be hidden once that person becomes a spirit.