This paper analyses two texts of Aquinas (Summa theologiae, I-II, q. 57, a. 5, ad 3, and Expositio libri peryermeneias I, 3, 107 ss.) where the truth of practical intellect is defined in accordance with Aristotle’s account in Nicomachean Ethics, 1139a27-31. The proposed interpreta-tion tries to show that both texts are arguably not incompatible. A last important claim is that according to the definition of practical truth practical intellect is supposed to work as a mesure for reality
