Commentaria in Primam Partem Summae Theologiae
Tommaso de Vio Cajetan (1469–1534)
First published 1507
Cajetan's Commentaria in Primam Partem Summae Theologiae offers an article-by-article exposition of Aquinas's Prima Pars. Its discussions of sacred doctrine, analogy, divine knowledge, and creation became important reference points in the later Thomist tradition. The present digital edition follows the Latin text of the Leonine edition and includes English and Spanish translations. Coverage is currently partial.
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Praefatio ad Oliverium Carrafam
In Prooemium Summae Theologiae
Quaestio I: De sacra doctrina, qualis sit, et ad quae se extendat
Articulus I: Utrum sit necessarium, praeter philosophicas disciplinas, aliam doctrinam haberi
Articulus II: Utrum sacra doctrina sit scientia
Articulus III: Utrum sacra doctrina sit una scientia
Articulus IV: Utrum sacra doctrina sit scientia practica
Articulus V: Utrum sacra doctrina sit dignior aliis scientiis
Articulus VI: Utrum haec doctrina sit sapientia
Articulus VII: Utrum deus sit subiectum huius scientiae
Articulus VIII: Utrum haec doctrina sit argumentativa
Articulus IX: Utrum sacra scriptura debeat uti metaphoris
Articulus X: Utrum sacra scriptura sub una littera habeat plures sensus
Quaestio II: De Deo, an Deus sit
Articulus I: Utrum Deum esse sit per se notum
Articulus II: Utrum Deum esse sit demonstrabile
Articulus III: Utrum Deus sit
Quaestio III: De Dei simplicitate
Articulus I: Utrum Deus sit corpus
Articulus II: Utrum in Deo sit compositio formae et materiae
Articulus III: Utrum sit idem Deus quod sua essentia vel natura
Articulus IV: Utrum in Deo sit idem essentia et esse
Articulus V: Utrum Deus sit in genere aliquo
Articulus VI: Utrum in Deo sint aliqua accidentia
Articulus VII: Utrum Deus sit omnino simplex
Articulus VIII: Utrum Deus in compositionem aliorum veniat
Quaestio IV: De Dei perfectione
Articulus I: Utrum Deus sit perfectus
Articulus II: Utrum in Deo sint perfectiones omnium rerum
Articulus III: Utrum aliqua creatura possit esse similis Deo
Quaestio V: De bono in communi
Articulus I: Utrum bonum differat secundum rem ab ente
Articulus II: Utrum bonum secundum rationem sit prius quam ens
Articulus III: Utrum omne ens sit bonum
Articulus IV: Utrum bonum habeat rationem causae finalis
Articulus V: Utrum ratio boni consistat in modo, specie et ordine
Articulus VI: Utrum convenienter dividatur bonum per honestum, utile et delectabile
Quaestio VI: De bonitate Dei
Articulus I: Utrum esse bonum Deo conveniat
Articulus II: Utrum Deus sit summum bonum
Articulus III: Utrum esse bonum per essentiam sit proprium Dei
Articulus IV: Utrum omnia sint bona bonitate divina
Quaestio VII: De infinitate Dei
Articulus I: Utrum Deus sit infinitus
Articulus II: Utrum aliquid aliud quam Deus possit esse infinitum per essentiam
Articulus III: Utrum possit esse aliquid infinitum actu secundum magnitudinem
Articulus IV: Utrum possit esse infinitum in rebus secundum multitudinem
Quaestio VIII: De existentia Dei in rebus
Articulus I: Utrum Deus sit in omnibus rebus
Articulus II: Utrum Deus sit ubique
Articulus III: Utrum Deus sit ubique per essentiam, praesentiam et potentiam
Articulus IV: Utrum esse ubique sit proprium Dei
Quaestio IX: De Dei immutabilitate
Articulus I: Utrum Deus sit omnino immutabilis
Articulus II: Utrum esse immutabile sit Dei proprium
Quaestio X: De Dei aeternitate
Articulus I: Utrum convenienter definiatur aeternitas, quod est interminabilis vitae tota simul et perfecta possessio
Articulus II: Utrum Deus sit aeternus
Articulus III: Utrum esse aeternum sit proprium Dei
Articulus IV: Utrum aeternitas differat a tempore
Articulus V: De differentia aevi et temporis
Articulus VI: Utrum sit unum aevum tantum
Quaestio XI: De unitate Dei
Articulus I: Utrum unum addat aliquid supra ens
Articulus II: Utrum unum et multa opponantur
Articulus III: Utrum Deus sit unus
Articulus IV: Utrum Deus sit maxime unus
Quaestio XII: Quomodo Deus a nobis cognoscatur
Articulus I: Utrum aliquis intellectus creatus possit Deum videre per essentiam
Articulus II: Utrum essentia Dei ab intellectu creato per aliquam similitudinem videatur
Articulus III: Utrum essentia Dei videri possit oculis corporalibus
Articulus IV: Utrum aliquis intellectus creatus per sua naturalia divinam essentiam videre possit
Articulus V: Utrum intellectus creatus ad videndum Dei essentiam aliquo creato lumine indigeat
Articulus VI: Utrum videntium essentiam Dei unus alio perfectius videat
Articulus VII: Utrum videntes Deum per essentiam ipsum comprehendant
Articulus VIII: Utrum videntes Deum per essentiam omnia in Deo videant
Articulus IX: Utrum ea quae videntur in Deo a videntibus divinam essentiam per aliquas similitudines videantur
Articulus X: Utrum videntes Deum per essentiam simul videant omnia quae in ipso vident
Articulus XI: Utrum aliquis in hac vita possit videre Deum per essentiam
Articulus XII: Utrum per rationem naturalem Deum in hac vita cognoscere possimus
Articulus XIII: Utrum per gratiam habeatur altior cognitio Dei quam ea quae habetur per rationem naturalem
Quaestio XIII: De nominibus Dei
Articulus I: Utrum aliquod nomen Deo conveniat
Articulus II: Utrum aliquod nomen dicatur de Deo substantialiter
Articulus III: Utrum aliquod nomen dicatur de Deo proprie
Articulus IV: Utrum nomina dicta de Deo sint nomina synonyma
Articulus V: Utrum ea quae de Deo dicuntur et creaturis, univoce dicantur de ipsis
Articulus VI: Utrum nomina per prius dicantur de creaturis quam de Deo
Articulus VII: Utrum nomina quae important relationem ad creaturas, dicantur de Deo ex tempore
Articulus VIII: Utrum hoc nomen *Deus* sit nomen naturae
Articulus IX: Utrum hoc nomen *Deus* sit communicabile
Articulus X: Utrum hoc nomen *Deus* univoce dicatur de Deo per participationem, secundum naturam, et secundum opinionem
Articulus XI: Utrum hoc nomen *qui est* sit maxime nomen Dei proprium
Articulus XII: Utrum propositiones affirmativae possint formari de Deo
Quaestio XIV: De scientia Dei
Articulus I: Utrum in Deo sit scientia
Articulus II: Utrum Deus intelligat se
Articulus III: Utrum Deus comprehendat seipsum
Articulus IV: Utrum ipsum intelligere Dei sit eius substantia
Articulus V: Utrum Deus cognoscat alia a se
Articulus VI: Utrum Deus cognoscat alia a se propria cognitione
Articulus VII: Utrum scientia Dei sit discursiva
Articulus VIII: Utrum scientia Dei sit causa rerum
Articulus IX: Utrum Deus habeat scientiam non entium
Articulus X: Utrum Deus cognoscat mala
Articulus XI: Utrum Deus cognoscat singularia
Articulus XII: Utrum Deus possit cognoscere infinita
Articulus XIII: Utrum scientia Dei sit futurorum contingentium
Articulus XIV: Utrum Deus cognoscat enuntiabilia
Articulus XV: Utrum scientia Dei sit variabilis
Articulus XVI: Utrum Deus de rebus habeat scientiam speculativam
Quaestio XV: De ideis
Articulus I: Utrum ideae sint
Articulus II: Utrum sint plures ideae
Articulus III: Utrum omnium quae cognoscit Deus, sint ideae
Quaestio XVI: De veritate
Articulus I: Utrum veritas sit tantum in intellectu
Articulus II: Utrum veritas sit in intellectu componente et dividente
Articulus III: Utrum verum et ens convertantur
Articulus IV: Utrum bonum secundum rationem sit prius quam verum
Articulus V: Utrum Deus sit veritas
Articulus VI: Utrum sit una sola veritas, secundum quam omnia sunt vera
Articulus VII: Utrum veritas creata sit aeterna
Articulus VIII: Utrum veritas sit imutabilis
Quaestio XVII: De falsitate
Articulus I: Utrum falsitas sit in rebus
Articulus II: Utrum in sensu sit falsitas
Articulus III: Utrum falsitas sit in intellectu
Articulus IV: Utrum verum et falsum sint contraria
Quaestio XVIII: De vita Dei
Articulus I: Utrum omnium naturalium rerum sit vivere
Articulus II: Utrum vita sit quaedam operatio
Articulus III: Utrum Deo conveniat vita
Articulus IV: Utrum omnia sint vita in Deo
Quaestio XIX: De voluntate Dei
Articulus I: Utrum in Deo sit voluntas
Articulus II: Utrum Deus velit alia a se
Articulus III: Utrum quidquid Deus vult, ex necessitate velit
Articulus IV: Utrum voluntas Dei sit causa rerum
Articulus V: Utrum voluntatis divinae sit assignare aliquam causam
Articulus VI: Utrum voluntas Dei semper impleatur
Articulus VII: Utrum voluntas Dei sit mutabilis
Articulus VIII: Utrum voluntas Dei necessitatem rebus volitis imponat
Articulus IX: Utrum voluntas Dei sit malorum
Articulus X: Utrum Deus habeat liberum arbitrium
Articulus XI: Utrum sit distinguenda in Deo voluntas signi
Articulus XII: Utrum convenienter circa divinam voluntatem ponantur quinque signa
Quaestio XX: De amore Dei
Articulus I: Utrum amor sit in Deo
Articulus II: Utrum Deus omnia amet
Articulus III: Utrum Deus aequaliter diligat omnia
Articulus IV: An Deus semper magis diligat meliora
Quaestio XXI: De iustitia et misericordia Dei
Articulus I: Utrum in Deo sit iustitia
Articulus II: Utrum iustitia Dei sit veritas
Articulus III: Utrum misericordia competat Deo
Articulus IV: Utrum in omnibus operibus Dei sit misericordia et iustitia
Quaestio XXII: De providentia Dei
Articulus I: Utrum providentia Deo conveniat
Articulus II: Utrum omnia sint subiecta divinae providentiae
Articulus III: Utrum Deus immediate omnibus provideat
Articulus IV: Utrum providentia rebus provisis necessitatem imponat
Quaestio XXIII: De praedestinatione
Articulus I: Utrum homines praedestinentur a Deo
Articulus II: Utrum praedestinatio aliquid ponat in praedestinato
Articulus III: Utrum Deus aliquem hominem reprobet
Articulus IV: Utrum praedestinati eligantur a Deo
Articulus V: Utrum praescientia meritorum sit causa praedestinationis
Articulus VI: Utrum praedestinatio sit certa
Articulus VII: Utrum numerus praedestinatorum sit certus
The title is clear. - In the body he does three things: first, concerning the certainty of the number of the predestined absolutely; second, concerning the number of the reprobate1; third, concerning the certainty, as far as we are concerned, of the number of the predestined2, he treats.
II. As to the first, the conclusion is this, answering the question affirmatively: The number of the predestined is certain to God; not only formally, but materially; not only as known, but as chosen and preordained.
This conclusion has three principal parts. And the first, namely that it is certain to God, is left standing as constant.
Second, namely, not only formally, but materially, and it is declared as regards the terms, while certain persons denying this are adduced: and it is proved by leading to an absurdity, thus. If the number of the predestined were certain to God formally only, the certainty of order attributed to predestination in the preceding article would be taken away: this is an absurdity: therefore. — The consequence is evident: because it could stand that Peter be predestined, and yet not be saved; and thus predestination would not infallibly attain its effect.
The third, namely, not only as known, but as predefinite, and it is declared with respect to its terms, by the example of the number of drops of rain and of the sand of the sea, with respect to ly known; and the difference between the number of dwellings of a house and the measurements of a wall, etc., and the number of stones, with respect to the builder, with respect to ly predefinite: and it is proved thus. Every agent intends to make something finite; therefore it intends some determinate measure in its effect; therefore it devises some number in the principal parts required per se for the whole; therefore God preordained in what measure the whole universe ought to be; therefore he predefinite what would be the fitting number of the essential parts of the universe, that is, the perpetual ones; therefore he predefinite a certain number of the predestined.
The antecedent is supposed from question seven. - The second consequence, however, is made clear from the difference between the number of things principally required for the work, and the number of those required only on account of something else. For the number of the former is predetermined; while as many of the latter are prescribed as will be needed for the construction of the former. - The third, however, is proved: because the whole universe is the proper effect of God. - The fourth, indeed, with respect to that term, namely the parts of the universe, is made clear from the difference between corruptible and incorruptible things, thus: in this respect, that the latter are for their own sake, but the former are for the sake of the preservation of the species, looking to the universe. And from this a corollary pertaining to the providence of God is inserted: namely, that the number of corruptible individuals outside the human species is certain to God not by predetermination, but by foreknowledge; whereas the number of species is certain to God in both ways, and likewise the number of elements, stars, and spheres. – Finally, the fifth is proved: because rational creatures attaining beatitude are ordered to the good of the universe before other creatures. Which is proved: because insofar as they are rational, they are simply incorruptible as such; but insofar as they attain beatitude, they more immediately reach the ultimate end itself of the whole universe, namely God.
III. Concerning the antecedent, a doubt arises on account of the infinity of motion. For it is agreed that, among the philosophers, the movers of the spheres intend to move always; and consequently they intend to produce an infinite effect. And yet in the text it is assumed that every agent intends to produce a finite effect.
To this there is a twofold reply. First, that this assumption is understood of an effect in act: for of such an effect it was proved in question 7 that it cannot be intensified by any agent. Now the motion of the heavens, it is evident, is not infinite in act: and therefore it does not stand against the proposition.
The philosophers would say, secondly, that the movers of the spheres do not intend infinite circulations per se and in the first place, but rather assimilation to God in causing other things; and because this is preserved by moving, therefore they intend to move always, as it were, per accidens; as if the infinite circulations were not for their own sake, but because so many are required for preserving, or diffusing, the perfection of things moved, up to the glorious God.
IV. Concerning the explanation of the parts of the universe, a doubt arises. For in I Caeli 3, Aristotle and St. Thomas hold that only simple bodies are the parts of the universe according to species; here, however, the species of mixed bodies, and of plants and animals, are added.
This can be said in two ways. First, because in Book I of the De Caelo the discussion concerns the substantial perfection of the universe, whereas here it concerns perfection after the manner of a passion or attribute. For all corporeal species are related to the simple bodies as passions to their subject, since from them they are made and subsist both actively and materially.
Second, it is said that the universe can be taken in two ways. In one way, for the corporeal universe as such: and in this way it is treated in I On the Heavens. And it is constituted from simple bodies alone: since there is no bodily mass in the universe except of simple bodies; for all bodily matter of mixed bodies is from the elements. In another way, for the universe of perfection: and thus it is treated here. And for its completeness all species are required, as is said in the text: for the specific perfections of these bodies are not from simple bodies as such, but from a certain higher nature, as is evident in the case of vital perfection.
V. Concerning the conclusion itself, note that Aureolus, as cited by Capreolus, in distinction XL of Book I 4, strives to attack it. But since he does not argue from proper and certain arguments, but from common ones pertaining to the discernment of the predestined from the reprobate, and he equivocates concerning the end of the universe, and these matters are set forth above 5, I judged it should be passed over: for from them the solution of all his objections is easily evident.
VI. As to the second 6, the conclusion is this: The number of the reprobate is not fixed in so absolute a manner. – And it is proved. For the elect, all things cooperate for good; therefore the reprobate have been preordained by God for the good of the elect; therefore the number of the reprobate is not fixed in so absolute a manner.
Here the word thus entirely comes in. For in the reprobate there are two things: namely, their very nature, and what pertains to their reprobate being. As regards nature, the number of elect and reprobate is predestined in the same way: since both are of the same nature—incorruptible, rational, etc. But as regards what is given by grace, just as the elect are predestined for their own sake, so that they may attain the ultimate end simply through their own acts and felicity, so the reprobate, like irrational creatures, are provided for not toward their own good (since they are deprived of felicity), but toward a good that is another's, namely that of God and the elect: thus the number of the elect is certain on account of themselves, while the number of the reprobate is certain on account of something else, that is, the elect. Hence, considering the reprobate with respect to their subject, we say that their number is certain even predestinatively. But considering them insofar as they are reprobate, we say that they are not fixed in number predestinatively; rather, divine providence makes use of as many reprobates as it sees can contribute to the good of the elect. And this distinction is what the text intends by those words, yet it is not thus entirely. For in saying not thus, it excluded the reprobate from the principal parts of the universe and from those that are per se first; but by adding the word entirely, it exempted them from being parts purely on account of something else; and thus it placed them, as it were, in the middle, on account of the incorruptibility of their subject, etc., as we have said.
VII. As to the third point 7, the number of predestined human beings is treated, namely, whether it is certain to us. Three opinions are reported, and none of them is approved; rather a fourth is set forth as better.
Let it be noted here that these opinions are not condemned. First, because in a matter highly doubtful, and hidden from us by certainty, the authors have spoken in an opinative manner. Second, because the authors of these opinions seem to have been illustrious, and even saints: for the second opinion is known to be Gregory's 8 The fourth, however, is said to be better than all the others, because it rests upon the authority of the Church, which says in the secret prayer: O God, to whom alone is known the number of the elect to be placed in supernal felicity. And in order to intimate this, the Author used the same words in the text.