This lecture discusses key ideas from the ancient philosopher Aristotle's work of moral theory, the Nicomachean Ethics.

Specifically it focuses focuses on Aristotle's Nicomachean Ethics book 6, and examines his distinction between truth in theory (or in contemplation, i.e. bearing upon theoretical or speculative matters) and truth in practice (or action, i.e. bearing upon practical or productive matters).

In theoretical matters, truth has to do primarily with the correspondence between what is or is not the case, on one side, and thought in the mind (or linguistic expressions).

Truth in practical matters is somewhat more complex, since it involves not only what is the case in the intellect, but also the desire or affectivity of the person (and intellect and desire come together in prohairesis, or the faculty of choice). It also involves desire and aversion on the part of the person.

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