Aquinas extends Aristotle's narrow concern with questions of truthfulness and falsehood about oneself to a more general consideration of truth and lies as such. The first section of this chapter promotes EN 4.7 within the larger contexts of EN 4.6-8 and EN 4 itself; this gives us a good idea of what Aristotle himself regards as distinctive about the virtue (and corresponding vices) discussed in EN 4.7. The second and third sections are devoted to detailed exegesis of the very finespun analysis conducted by Aristotle in EN 4.7. The detail is necessary in order to clearly show the coherence of Aquinas's interpretation. The fourth section looks directly at this interpretation as set out in Aquinas's Ethics commentary. This chapter examines the relationship between ST 2-2.109-113 and EN 4.7, noting a surprising connection with Augustine. Aquinas exposes things that are not found in EN 4.7.