Classicly

The Mystic Will is a method of developing and strengthening the faculties of the mind, through the awakened will, by a simple, scientific process possible to any person of ordinary intelligence.

Author's Preface:

During the past few years the most serious part of the author's study and reflection has been devoted to the subjects discussed in this book. These, briefly stated, are as follows: Firstly, that all mental or cerebral faculties can by direct scientific treatment be influenced to what would have once been regarded as miraculous action, and which is even yet very little known or considered. Secondly, in development of this theory, and as confirmed by much practical and personal experience, that the Will can by very easy processes of training, or by aid of Auto-Suggestion, be strengthened to any extent, and states of mind soon induced, which can be made by practice habitual.