Chapter 25 — Part III: The Decalogue — The Second Commandment
Section 33. An oath has its origin in faith, by which men believe God to be the author of all truth, who can never deceive others nor be deceived, to whose eyes all things are naked and open, who, in fine, superintends all human affairs with an admirable providence, and governs the world. Filled with this faith we appeal to God as a witness of the truth, as a witness whom it would be wicked and impious to distrust.