25. The soul enveloped in its perispirit carries thus in it its luminous principle. Penetrating matter by virtue of its ethereal essence, there are no opaque bodies to its vision.
However, the spiritual sight has not the same penetration or extent with all spirits. The pure spirits alone possess it in all its power. With inferior ones it is weakened by the coarseness of the perispirit, which interposes itself like a fog.
It manifests itself in different degrees with incarnates by the phenomenon of second sight, whether in a natural or magnetic somnambulism, or in a waking state. According to the power of the faculty is the lucidity, more or less great. By the aid of this faculty some persons see the interior of the organism, and describe the cause of maladies.