It is when the second stage of meditation is fully developed that occult powers may arise. The mind is able so to identify itself with anyone as to reproduce his characteristics within itself quite faithfully. It may even overcome distance and do so even when the other person is not physically present but fifty miles away. Indeed, he who acquires this power of clairvoyance may have to protect himself against mixing up the other man's thoughts with his own, or against mistaking them as his own.
-- Notebooks Category 4: Elementary Meditation > Chapter 1: Preparatory > # 408