The Advanced Course in Spiritual Clairvoyance by L.W. de Laurence is a comprehensive guide to developing one's clairvoyant abilities. The book covers a range of topics including the nature of the soul, the astral plane, and the different types of clairvoyance. It provides practical exercises for developing clairvoyance, such as meditation, visualization, and psychic protection techniques. The author also discusses the ethical considerations of using...