The Philosophy of Natural Magic, by Henry Cornelius Agrippa, L. W. de Laurence ed. , at sacred-texts.com
Judicious Reader: This is true and sublime Occult Philosophy. To understand the mysterious influences of the intellectual world upon the celestial, and of both upon the terrestrial; and to know how to dispose and fit ourselves so as to be capable of receiving the superior operations of these worlds, whereby we may be enabled to operate wonderful things by a natural power—to discover the secret counsels of men, to increase riches, to overcome enemies, to procure the favor of men, to expel diseases, to preserve health, to prolong life, to renew youth, to foretell future events, to see and know things done many miles off, and such like as these. These things may seem incredible, yet read but the ensuing treatise and thou shalt see the possibility confirmed both by reason and example.