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Summa Theologiae · I, q. 21, a. 2

Whether the Justice of God Is Truth?

Thomas Aquinas, Summa Theologiae, First Part, question 21, The Justice and Mercy of God, article 2. About 2 min.

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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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Objection 1: It seems that the justice of God is not truth. For justice resides in the will; since, as Anselm says (Dial. Verit. 13), it is a rectitude of the will, whereas truth resides in the intellect, as the Philosopher says (Metaph. vi; Ethic. vi, 2,6). Therefore justice does not appertain to truth.

Obj. 2: Further, according to the Philosopher (Ethic. iv, 7), truth is a virtue distinct from justice. Truth therefore does not appertain to the idea of justice.

On the contrary, it is said (Ps. 84:11): "Mercy and truth have met each other": where truth stands for justice.

I answer that, Truth consists in the equation of mind and thing, as said above (Q. 16, A. 1). Now the mind, that is the cause of the thing, is related to it as its rule and measure; whereas the converse is the case with the mind that receives its knowledge from things. When therefore things are the measure and rule of the mind, truth consists in the equation of the mind to the thing, as happens in ourselves. For according as a thing is, or is not, our thoughts or our words about it are true or false. But when the mind is the rule or measure of things, truth consists in the equation of the thing to the mind; just as the work of an artist is said to be true, when it is in accordance with his art.

Now as works of art are related to art, so are works of justice related to the law with which they accord. Therefore God's justice, which establishes things in the order conformable to the rule of His wisdom, which is the law of His justice, is suitably called truth. Thus we also in human affairs speak of the truth of justice.

Reply Obj. 1: Justice, as to the law that governs, resides in the reason or intellect; but as to the command whereby our actions are governed according to the law, it resides in the will.

Reply Obj. 2: The truth of which the Philosopher is speaking in this passage, is that virtue whereby a man shows himself in word and deed such as he really is. Thus it consists in the conformity of the sign with the thing signified; and not in that of the effect with its cause and rule: as has been said regarding the truth of justice.

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, First Part. Project Gutenberg #17611. 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.