Liber Aleph vel CXI: The Book of Wisdom or Folly is the title of The Equinox, volume III, number VI, by Aleister Crowley. The book is written in the form of an epistle to his magical son, Charles Stansfeld Jones, Frater Achad, whom Crowley later doubted as being his true magical son, asserting that Achad had in fact gone insane, citing as evidence Achad's "upending the tree of life" in his Q.B.L., or The Bride's Reception, the first of Achad's major qabalistic works.