Bibliotheca Catholicaa library of libraries
Support
Summa Theologiae · II-II, q. 89

Question 89. Of Oaths

Thomas Aquinas, Summa Theologiae, Second Part of the Second Part. 10 articles.

Read in the reading room → This question at New Advent

Text: Summa Theologiae, Project Gutenberg #18755, Second Part of the Second Part (Secunda Secundae), translated by the Fathers of the English Dominican Province. The Second Part of the Second Part of the Summa in the English Dominican translation (first printed 1911 to 1925; second and revised edition from 1920). A sample check on 2026-11-09 against pre-1931 printings at the Internet Archive (first printings of 1915 and 1916 and the second and revised edition of the 1920s) found that the article text matches, with no 1947 introduction, synopsis, or index. Question and article numbers were added by the transcriber. Rights: Public domain (US)

This eBook is for the use of anyone anywhere in the United States and most other parts of the world at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at www.gutenberg.org. If you are not located in the United States, you will have to check the laws of the country where you are located before using this eBook.

We must now consider those external acts of religion, whereby something Divine is taken by man: and this is either a sacrament or the Name of God. The place for treating of the taking of a sacrament will be in the Third Part of this work: of the taking of God's Name we shall treat now. The Name of God is taken by man in three ways. First, by way oath in order to confirm one's own assertion: secondly, by way of adjuration as an inducement to others: thirdly, by way of invocation for the purpose of prayer or praise. Accordingly we must first treat of oaths: and under this head there are ten points of inquiry:

(1) What is an oath?

(2) Whether it is lawful?

(3) What are the accompanying conditions of an oath?

(4) Of what virtue is it an act?

(5) Whether oaths are desirable, and to be employed frequently as something useful and good?

(6) Whether it is lawful to swear by a creature?

(7) Whether an oath is binding?

(8) Which is more binding, an oath or a vow?

(9) Whether an oath is subject to dispensation?

(10) Who may lawfully swear, and when?

Articles

  1. Whether to Swear Is to Call God to Witness?
  2. Whether It Is Lawful to Swear?
  3. Whether Three Accompanying Conditions of an Oath Are Suitably Assigned, Namely, Justice, Judgment, and Truth?
  4. Whether an Oath Is an Act of Religion, or Latria?
  5. Whether Oaths Are Desirable and to Be Used Frequently As Something Useful and Good?
  6. Whether It Is Lawful to Swear by Creatures?
  7. Whether an Oath Has a Binding Force?
  8. Whether an Oath Is More Binding Than a Vow?
  9. Whether Anyone Can Dispense from an Oath?
  10. Whether an Oath Is Voided by a Condition of Person or Time?

Also online, linked only: the same translation at New Advent and the Latin text at Corpus Thomisticum. Neither is copied here.

Source: Thomas Aquinas. Summa Theologica, Second Part of the Second Part. Project Gutenberg #18755. Project Gutenberg record. Public domain in the USA. Outside the U.S., check local copyright rules. Project Gutenberg notices retained. The full Project Gutenberg license is kept in the hosted text.