The mysterious Brotherhood of Adepts, who keep powerful Knowledge about the foundations of the universe, which has an invariably beneficial influence on the destinies of individuals and entire nations, has always attracted and served as an example to follow for all those striving for advancement on the spiritual Path. In the book of the outstanding American researcher, Manly P Hall collected historical data and legends of the peoples of the world, testifying to the existence and direct participation in the affairs of mankind of the great Brotherhood of Teachers. This edition includes the first four parts of the monograph, published by the author as separate books during 1953–1975. The fifth and final part - “Revered Mentors of Jains, Sikhs and Parsis” - was published in 1985 and is awaiting its translation into Russian.