Thomas Aquinas, Summa Theologiae

Objection 1: It seems that truth does not reside only in the intellect, but rather in things. For Augustine (Soliloq. ii, 5) condemns this definition of truth, "That is true which is seen"; since it would follow that stones hidden in the bosom of the earth would not be true stones, as they are not seen. He also condemns the following, "That is true which is as it appears to the knower, who is willing and able to know," for hence it would follow that nothing would be true, unless someone could know it. Therefore he defines truth thus: "That is true which is." It seems, then, that truth resides in things, and not in the intellect.

Objection 2: Further, whatever is true, is true by reason of truth. If, then, truth is only in the intellect, nothing will be true except in so far as it is understood. But this is the error of the ancient philosophers, who said that whatever seems to be true is so. Consequently mutual contradictories seem to be true as seen by different persons at the same time.

Objection 3: Further, "that, on account of which a thing is so, is itself more so," as is evident from the Philosopher (Poster. i). But it is from the fact that a thing is or is not, that our thought or word is true or false, as the Philosopher teaches (Praedicam. iii). Therefore truth resides rather in things than in the intellect.

On the contrary, The Philosopher says (Metaph. vi), " The true and the false reside not in things, but in the intellect."

I answer that, As the good denotes that towards which the appetite tends, so the true denotes that towards which the intellect tends. Now there is this difference between the appetite and the intellect, or any knowledge whatsoever, that knowledge is according as the thing known is in the knower, whilst appetite is according as the desirer tends towards the thing desired. Thus the term of the appetite, namely good, is in the object desirable, and the term of the intellect, namely true, is in the intellect itself. Now as good exists in a thing so far as that thing is related to the appetite---and hence the aspect of goodness passes on from the desirable thing to the appetite, in so far as the appetite is called good if its object is good; so, since the true is in the intellect in so far as it is conformed to the object understood, the aspect of the true must needs pass from the intellect to the object understood, so that also the thing understood is said to be true in so far as it has some relation to the intellect. Now a thing understood may be in relation to an intellect either essentially or accidentally. It is related essentially to an intellect on which it depends as regards its essence; but accidentally to an intellect by which it is knowable; even as we may say that a house is related essentially to the intellect of the architect, but accidentally to the intellect upon which it does not depend.

Now we do not judge of a thing by what is in it accidentally, but by what is in it essentially. Hence, everything is said to be true absolutely, in so far as it is related to the intellect from which it depends; and thus it is that artificial things are said to be true a being related to our intellect. For a house is said to be true that expresses the likeness of the form in the architect's mind; and words are said to be true so far as they are the signs of truth in the intellect. In the same way natural things are said to be true in so far as they express the likeness of the species that are in the divine mind. For a stone is called true, which possesses the nature proper to a stone, according to the preconception in the divine intellect. Thus, then, truth resides primarily in the intellect, and secondarily in things according as they are related to the intellect as their principle. Consequently there are various definitions of truth. Augustine says (De Vera Relig. xxxvi), "Truth is that whereby is made manifest that which is;" and Hilary says (De Trin. v) that "Truth makes being clear and evident" and this pertains to truth according as it is in the intellect. As to the truth of things in so far as they are related to the intellect, we have Augustine's definition (De Vera Relig. xxxvi), "Truth is a supreme likeness without any unlikeness to a principle": also Anselm's definition (De Verit. xii), "Truth is rightness, perceptible by the mind alone"; for that is right which is in accordance with the principle; also Avicenna's definition (Metaph. viii, 6), "The truth of each thing is a property of the essence which is immutably attached to it." The definition that "Truth is the equation of thought and thing" is applicable to it under either aspect.

Reply to Objection 1: Augustine is speaking about the truth of things, and excludes from the notion of this truth, relation to our intellect; for what is accidental is excluded from every definition.

Reply to Objection 2: The ancient philosophers held that the species of natural things did not proceed from any intellect, but were produced by chance. But as they saw that truth implies relation to intellect, they were compelled to base the truth of things on their relation to our intellect. From this, conclusions result that are inadmissible, and which the Philosopher refutes (Metaph. iv). Such, however, do not follow, if we say that the truth of things consists in their relation to the divine intellect.

Reply to Objection 3: Although the truth of our intellect is caused by the thing, yet it is not necessary that truth should be there primarily, any more than that health should be primarily in medicine, rather than in the animal: for the virtue of medicine, and not its health, is the cause of health, for here the agent is not univocal. In the same way, the being of the thing, not its truth, is the cause of truth in the intellect. Hence the Philosopher says that a thought or a word is true "from the fact that a thing is, not because a thing is true."

Articulus 1

Argumentum 1

Ad primum sic proceditur. Videtur quod veritas non sit tantum in intellectu, sed magis in rebus.

Augustinus enim, in libro soliloq., reprobat hanc notificationem veri, verum est id quod videtur, quia secundum hoc, lapides qui sunt in abditissimo terrae sinu, non essent veri lapides, quia non videntur. Reprobat etiam istam, verum est quod ita se habet ut videtur cognitori, si velit et possit cognoscere, quia secundum hoc sequeretur quod nihil esset verum, si nullus posset cognoscere. Et definit sic verum, verum est id quod est.

Et sic videtur quod veritas sit in rebus, et non in intellectu.

Argumentum 2

Praeterea, quidquid est verum, veritate verum est. Si igitur veritas est in intellectu solo, nihil erit verum nisi secundum quod intelligitur, quod est error antiquorum philosophorum, qui dicebant omne quod videtur, esse verum.

Ad quod sequitur contradictoria simul esse vera, cum contradictoria simul a diversis vera esse videantur.

Argumentum 3

Praeterea, propter quod unumquodque, et illud magis, ut patet I poster.. Sed ex eo quod res est vel non est, est opinio vel oratio vera vel falsa, secundum philosophum in praedicamentis.

Ergo veritas magis est in rebus quam in intellectu.

Sed Contra

Sed contra est quod philosophus dicit, VI metaphys., quod verum et falsum non sunt in rebus, sed in intellectu.

Corpus

Respondeo dicendum quod, sicut bonum nominat id in quod tendit appetitus, ita verum nominat id in quod tendit intellectus.

Hoc autem distat inter appetitum et intellectum, sive quamcumque cognitionem, quia cognitio est secundum quod cognitum est in cognoscente, appetitus autem est secundum quod appetens inclinatur in ipsam rem appetitam. Et sic terminus appetitus, quod est bonum, est in re appetibili, sed terminus cognitionis, quod est verum, est in ipso intellectu. Sicut autem bonum est in re, inquantum habet ordinem ad appetitum; et propter hoc ratio bonitatis derivatur a re appetibili in appetitum, secundum quod appetitus dicitur bonus, prout est boni, ita, cum verum sit in intellectu secundum quod conformatur rei intellectae, necesse est quod ratio veri ab intellectu ad rem intellectam derivetur, ut res etiam intellecta vera dicatur, secundum quod habet aliquem ordinem ad intellectum.

Res autem intellecta ad intellectum aliquem potest habere ordinem vel per se, vel per accidens. Per se quidem habet ordinem ad intellectum a quo dependet secundum suum esse, per accidens autem ad intellectum a quo cognoscibilis est. Sicut si dicamus quod domus comparatur ad intellectum artificis per se, per accidens autem comparatur ad intellectum a quo non dependet.

Iudicium autem de re non sumitur secundum id quod inest ei per accidens, sed secundum id quod inest ei per se. Unde unaquaeque res dicitur vera absolute, secundum ordinem ad intellectum a quo dependet. Et inde est quod res artificiales dicuntur verae per ordinem ad intellectum nostrum, dicitur enim domus vera, quae assequitur similitudinem formae quae est in mente artificis; et dicitur oratio vera, inquantum est signum intellectus veri.

Et similiter res naturales dicuntur esse verae, secundum quod assequuntur similitudinem specierum quae sunt in mente divina, dicitur enim verus lapis, qui assequitur propriam lapidis naturam, secundum praeconceptionem intellectus divini. Sic ergo veritas principaliter est in intellectu; secundario vero in rebus, secundum quod comparantur ad intellectum ut ad principium.

Et secundum hoc, veritas diversimode notificatur.

Nam Augustinus, in libro de vera relig., dicit quod veritas est, qua ostenditur id quod est.

Et Hilarius dicit quod verum est declarativum aut manifestativum esse.

Et hoc pertinet ad veritatem secundum quod est in intellectu.

Ad veritatem autem rei secundum ordinem ad intellectum, pertinet definitio Augustini in libro de vera relig., veritas est summa similitudo principii, quae sine ulla dissimilitudine est.

Et quaedam definitio Anselmi, veritas est rectitudo sola mente perceptibilis; nam rectum est, quod principio concordat.

Et quaedam definitio Avicennae, veritas uniuscuiusque rei est proprietas sui esse quod stabilitum est ei.

Quod autem dicitur quod veritas est adaequatio rei et intellectus potest ad utrumque pertinere.

Ad 1

Ad primum ergo dicendum quod Augustinus loquitur de veritate rei; et excludit a ratione huius veritatis, comparationem ad intellectum nostrum.

Nam id quod est per accidens, ab unaquaque definitione excluditur.

Ad 2

Ad secundum dicendum quod antiqui philosophi species rerum naturalium non dicebant procedere ab aliquo intellectu, sed eas provenire a casu, et quia considerabant quod verum importat comparationem ad intellectum, cogebantur veritatem rerum constituere in ordine ad intellectum nostrum.

Ex quo inconvenientia sequebantur quae philosophus prosequitur in IV metaphys..

Quae quidem inconvenientia non accidunt, si ponamus veritatem rerum consistere in comparatione ad intellectum divinum.

Ad 3

Ad tertium dicendum quod, licet veritas intellectus nostri a re causetur, non tamen oportet quod in re per prius inveniatur ratio veritatis, sicut neque in medicina per prius invenitur ratio sanitatis quam in animali; virtus enim medicinae, non sanitas eius, causat sanitatem, cum non sit agens univocum. Et similiter esse rei, non veritas eius, causat veritatem intellectus.

Unde philosophus dicit quod opinio et oratio vera est ex eo quod res est, non ex eo quod res vera est.