The ancient tradition of Porphyry's 'change of views' and even 'vacillation' on a number of issues is cited in support. Porphyry's Platonic commentaries must have been relatively diffuse compared with the single-minded approach of Iamblichus and Proclus. The total transcendence of the One is arguably one of the most innovative of Plotinus' ideas and one not without its difficulties, as is confirmed by the constant attention paid to it by later Platonists. The tripartite soul has, claims Porphyry, primarily an ethical role and then proceeds to add the traditional Aristotelian list of soul faculties as an interpretation of Plato's more general view. Porphyry's interest in the physical world is primarily from the metaphysical perspective with its concern for principles. Porphyry's commentaries not only firmly rooted the logical works of Aristotle in the curriculum of the Platonic schools but provided an important source of information and exegesis on which Iamblichus and Proclus would later draw.