Aristotle noted explicitly that the practical inseparability of materiality and form (hylomorphism) rules out a view of the relation of soul and body as comparable to that of a pilot in a ship. This excludes in advance the troublesome soul/body, mind/matter, us/world dualisms of Augustine and Descartes. (See also Naturalness, Mindedness; Reason, Nature; Ricoeur on Embodiment.)