Aristotle on Practical Truth
Aristotle’s theories of truth, practical reasoning, and action are some of the most influential theories in the history of philosophy. It is surprising, then, that so little attention has been given to his notion of practical truth. In Aristotle on Practical Truth, C. M. M. Olfert gives the first book-length treatment of this notion and the role of truth in our practical lives overall. She offers a novel account of practical truth: it is the truth, in the technical Aristotelian sense of “truth,” about what is good simpliciter (haplôs) for a particular person in her particular situation. Olfert argues that, understood in this way, Aristotle’s notion of practical truth is an attractive idea that illuminates the core of his practical philosophy. But it is also an idea that challenges a common view that in practical reasoning, we aim at action or acting well as our primary goals, not at truth and knowledge. Contrary to this common view, Olfert shows that in dialogues such as Charmides, Protagoras, and Republic, Plato describes practical reasoning as being concerned equally with grasping the truth and with acting well. She argues that Aristotle develops this Platonic picture with the notion of practical truth and with a technical notion of rational action as fitting ourselves to the world. Using key texts from the Nicomachean and Eudemian Ethics, as well as De Anima, Metaphysics, De Interpretatione, and Categories, Olfert demonstrates that practical truth deserves to be treated as a central and plausible Aristotelian idea.