When a pupil becomes clairvoyant, the passions that emanate from people, look to him like a tableau, from which centre they radiate. Mirrored passions appear as animals assaulting him. Man sees the lower passions around him as all kinds of wild animals, such as mice, rats and the like. If the student, not having learned this, experiences for the first time his own passions as mice and rats rushing at him, then pathological conditions such as paranoia might easily occur.
Source (German): Rudolf Steiner – GA 101 – Mythen und Sagen Okkulte Zeichen und Symbole – Cologne, December 27, 1907 (page 224)