Śaṅkara repudiates rival philosophies such as the Nyāya school which rejects witnessing consciousness and self-illumination in favor of other-illumination (paraprakāśa)—a thesis more akin to contemporary higher order theories. Nyāya argues that a second cognition is required to illumine the first. Śaṅkara’s basic counter-critique is that if a primary cognition requires a second apperceptive cognition to be known, then the second would require a third, etc., leading to a vicious infinite regressi