 Whether a monothetic approach focuses on one essential property or a set, and whether that essence is the substance or the function of the religion, those using this approach ask a Yes/No question regarding a single criterion. This approach therefore typically produces relatively clear lines between what is and is not religion. Given Tylor’s monothetic definition, for instance, a form of life must include belief in spiritual beings to be a religion; a form of life lacking this property would not be a religion, even if it included belief in a general order of existence that participants took as their ultimate concern, and even if that form of life included rituals, ethics, and scriptures. In a famous discussion, Melford Spiro (1966) works with a Tylorean definition and argues exactly this: lacking a belief in superhuman beings, Theravada Buddhism, for instance, is something other than a  religion.[8]  For Spiro, there is nothing pejorative about this classification.