Abstract
This essay interrogates the dominant conception of natural ability in classical rhetoric, the necessary-but-not-sufficient theory of aptitude. It describes articulations of this commonplace, by Quintilian and Plato, and then specifically examines Isocrates' problematic affirmation and resistance to a highly determinant version of aptitude. This essay suggests that in the context of contemporary composition studies, Isocratic ambivalence may represent a productive strategy in order to reinvigorate dormant inquiries in language, human nature, and ethics, and to contest powerful attitudes and assumptions that currently champion the primacy of natural ability over experience.