"He [Marcus Aurelius Antoninus] advises us to examine well all the impressions on our minds and to form a right judgment of them, to make just conclusions, and to inquire into the meanings of words, and so far to apply Dialectic, but he has no attempt at any exposition of Dialectic, and his philosophy is in substance purely moral and practical. ...an examination implies a use of Dialectic, which Antoninus accordingly employed as a means towards establishing his Physical, Theological, and Ethical principles."