 By 830 Kūkai has shifted his interest from an earlier focus upon the controversy between Madhaymaka and Yogācāra concerning the emptiness or existence of the dharmas and his critique of their view on language as not conveying truth (the Dharma), to evaluating Buddhist doctrines as a whole, including the other major Buddhist schools. This shift is most likely connected to the dispute on-going during that period between the founder of the Tendai school, Saichō, and the older Nara Buddhist schools. In providing a comprehensive scheme that would explain the place of each religious teaching as well as the place of esoteric Buddhism in relation to the other Buddhist doctrines, Kūkai aimed to demonstrate the significance of his version of Buddhism.