Tattvas divide into three groups: Ashuddha, or impure (material, sensorial, the organs of action, the mind and the ego), Shuddhashuddha, or pure-impure (the soul and its limitations) and Shudda, or pure (internal aspects of the Absolute). The impure tattvas are the domain of objectivity and duality, the pure-impure tattvas are the domain of knowledge and the pure tattvas are the domain of transcendental unity and non-differentiation.