"That Hieronymous Bosch. What a weirdo. "
Portrait of Jheronimus Bosch (‘Jeronimus Bos painctre’). Red and black crayon. From Recueil d’Arras (fol. 275). Arras, Bibliothèque Municipale.
Public Domain Jheronimus Bosch

 Hieronymous Bosch was a 15th-century Dutch artist known for his enigmatic paintings featuring religious and demonic imagery. Crowley is likely comparing the complexities and macabre imagery of the illustrations with the atrocities of the Spanish Inquisition.

The Garden of Earthly Delights.
Public DomainThe Garden of Earthly Delights. - Credit: Hieronymous Bosch