Liber III vel Jugorum

Liber III is a practical Thelemic exercise in self-discipline, designed to train concentration and weaken habitual patterns through strict mental and behavioral controls. Its historical significance lies in its influence on modern ritual training, and readers will find a severe but methodical regimen aimed at strengthening awareness, will, and mastery of the mind.

Aleister Crowley (1875–1947) was an English occultist, ceremonial magician, poet, and religious innovator who founded Thelema, a modern esoteric system centered on will, ritual, and spiritual liberation. His many books, including Liber AL vel Legis and Magick in Theory and Practice, made him one of the most influential figures in twentieth-century occult literature.