This book was originally written for the purpose of disenchanting certain credulous inquirers, who fancied that the exercise of spiritual powers could be taught by teaching them certain incantations and formulas. It was to prove that spiritual powers must be developed before they can be exercised, and to explain the conditions necessary for their development. Since the appearance of the previous edition, a little additional knowledge, gained by the experiences of my own inner life, has enabled me to make certain corrections; to sift out much of what was irrelevant, and to remodel a great deal of what was incorrectly expressed. Moreover in this edition an attempt has been made to answer the numerous questions which have been addressed to me by the readers of "Magic". The most serious objection which has been made against this book has been on account of its title; but the causes which induced me to select such a title were suggested by the purpose for which the book was intended; nor would I at present be able to find one more appropriate for it, for "Magic" means that divine art or exercise of spiritual power by which the awakened spirit in man controls the invisible living elements in the soul-substance of the universe; but, above all, those in his own soul, which are the ones nearest to him. If we desire to master any forces whatever, it is, above all, necessary to know what they are and how they originate, and as we have no better means to study the qualities of any internal forces, than by observing those which are active within ourselves, the perception of the processes going on within our own psychic organism, will be the means to accomplish our object.