Summa Theologiae · I, q. 16
Question 16. Of Truth
Thomas Aquinas, Summa Theologiae, First Part. 8 articles.
Text: Summa Theologiae, Project Gutenberg #17611, First Part (Prima Pars), translated by the Fathers of the English Dominican Province. The First 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. The phrase “From the Complete American Edition” in Gutenberg's catalog title is a provenance note only. Question and article numbers were added by the transcriber. Rights: Public domain (US)
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Since knowledge is of things that are true, after the consideration of the knowledge of God, we must inquire concerning truth. About this there are eight points of inquiry:
(1) Whether truth resides in the thing, or only in the intellect?
(2) Whether it resides only in the intellect composing and dividing?
(3) On the comparison of the true to being.
(4) On the comparison of the true to the good.
(5) Whether God is truth?
(6) Whether all things are true by one truth, or by many?
(7) On the eternity of truth.
(8) On the unchangeableness of truth.