The mystic key to spiritual illumination and occult mastery

Dewey’s book offers a practical and interpretive guide to spiritual development framed in occult terms. It reflects the modern esoteric literature of self-culture and promised inner attainment, and readers will find teachings on concentration, hidden laws, and methods for personal transformation.

I cannot confidently identify John Hamlin Dewey from the name alone. The entry appears to be connected with religious, philosophical, or esoteric literature, but I would need additional information to provide an accurate biography.