Chapter 25 — Part III: The Decalogue — The Second Commandment
Section 39. Various Ways In Which Cod's Name Is Dishonoured: False Oaths — Among false swearers are to be numbered not only those who affirm as true what they know to be false, but also those who swear to what is really true, believing it to be false. For since the essence of a lie consists in speaking contrary to one's belief and conviction, these persons are evidently guilty of a lie, and of perjury.