The truth is, that beneath the material chemistry, astronomy and psychology (that is, the psychology in its phase of “brain-action”), the ancients possessed a knowledge of transcendental astronomy, called astrology; of transcendental chemistry, called alchemy; of transcendental psychology, called mystic psychology. They possessed the Inner Knowledge as well as the Outer Knowledge, the latter alone being possessed by modern scientists. Among the many secret branches of knowledge possessed by the Hermetists, was that known as Mental Transmutation
The Kyabalion (via masonictraveler)