Franklin Merrell-Wolff considers the ethical background that forms the basis of the moral discipline necessary for following the yoga of knowledge. He restricts this discourse to the subject of yogic purification of the individual and is not here discussing the orientation of compassion toward others. He begins by noting that purification consists of three aspects; namely, physical, vital, and mental. He comments on diet, city life, general physical influences, sexuality, and cravings; he insists that cravings of all sorts whatsoever must be overcome by the power of will in the practice of a self-imposed discipline. Wolff goes on to outline what is necessary to achieve purity and clarity of thought, and for this he advocates a protracted experience working with pure mathematical conceptions. He proceeds to offer a description of a super-conceptual state of consciousness transcending this purity of thought and again asserts that purity is the supreme requirement for attaining this consciousness. He continues by describing the role of a competent guru and discusses the nature of the Current and his experience with it.