Thomas Aquinas, Summa Theologiae

Objection 1: It would seem that the more universal is not first in our intellectual cognition. For what is first and more known in its own nature, is secondarily and less known in relation to ourselves. But universals come first as regards their nature, because "that is first which does not involve the existence of its correlative" (Categor. ix). Therefore the universals are secondarily known as regards our intellect.

Objection 2: Further, the composition precedes the simple in relation to us. But universals are the more simple. Therefore they are known secondarily by us.

Objection 3: Further, the Philosopher says (Phys. i, 1), that the object defined comes in our knowledge before the parts of its definition. But the more universal is part of the definition of the less universal, as "animal" is part of the definition of "man." Therefore the universals are secondarily known by us.

Objection 4: Further, we know causes and principles by their effects. But universals are principles. Therefore universals are secondarily known by us.

On the contrary, "We must proceed from the universal to the singular and individual" (Phys. i, 1)

I answer that, In our knowledge there are two things to be considered. First, that intellectual knowledge in some degree arises from sensible knowledge: and, because sense has singular and individual things for its object, and intellect has the universal for its object, it follows that our knowledge of the former comes before our knowledge of the latter. Secondly, we must consider that our intellect proceeds from a state of potentiality to a state of actuality; and every power thus proceeding from potentiality to actuality comes first to an incomplete act, which is the medium between potentiality and actuality, before accomplishing the perfect act. The perfect act of the intellect is complete knowledge, when the object is distinctly and determinately known; whereas the incomplete act is imperfect knowledge, when the object is known indistinctly, and as it were confusedly. A thing thus imperfectly known, is known partly in act and partly in potentiality, and hence the Philosopher says (Phys. i, 1), that "what is manifest and certain is known to us at first confusedly; afterwards we know it by distinguishing its principles and elements." Now it is evident that to know an object that comprises many things, without proper knowledge of each thing contained in it, is to know that thing confusedly. In this way we can have knowledge not only of the universal whole, which contains parts potentially, but also of the integral whole; for each whole can be known confusedly, without its parts being known. But to know distinctly what is contained in the universal whole is to know the less common, as to "animal" indistinctly is to know it as "animal"; whereas to know "animal" distinctly is know it as "rational" or "irrational animal," that is, to know a man or a lion: therefore our intellect knows "animal" before it knows man; and the same reason holds in comparing any more universal idea with the less universal.

Moreover, as sense, like the intellect, proceeds from potentiality to act, the same order of knowledge appears in the senses. For by sense we judge of the more common before the less common, in reference both to place and time; in reference to place, when a thing is seen afar off it is seen to be a body before it is seen to be an animal; and to be an animal before it is seen to be a man, and to be a man before it seen to be Socrates or Plato; and the same is true as regards time, for a child can distinguish man from not man before he distinguishes this man from that, and therefore "children at first call men fathers, and later on distinguish each one from the others" (Phys. i, 1). The reason of this is clear: because he who knows a thing indistinctly is in a state of potentiality as regards its principle of distinction; as he who knows "genus" is in a state of potentiality as regards "difference." Thus it is evident that indistinct knowledge is midway between potentiality and act.

We must therefore conclude that knowledge of the singular and individual is prior, as regards us, to the knowledge of the universal; as sensible knowledge is prior to intellectual knowledge. But in both sense and intellect the knowledge of the more common precedes the knowledge of the less common.

Reply to Objection 1: The universal can be considered in two ways. First, the universal nature may be considered together with the intention of universality. And since the intention of universality---viz. the relation of one and the same to many---is due to intellectual abstraction, the universal thus considered is a secondary consideration. Hence it is said (De Anima i, 1) that the "universal animal is either nothing or something secondary." But according to Plato, who held that universals are subsistent, the universal considered thus would be prior to the particular, for the latter, according to him, are mere participations of the subsistent universals which he called ideas.

Secondly, the universal can be considered in the nature itself---for instance, animality or humanity as existing in the individual. And thus we must distinguish two orders of nature: one, by way of generation and time; and thus the imperfect and the potential come first. In this way the more common comes first in the order of nature; as appears clearly in the generation of man and animal; for "the animal is generated before man," as the Philosopher says (De Gener. Animal ii, 3). The other order is the order of perfection or of the intention of nature: for instance, act considered absolutely is naturally prior to potentiality, and the perfect to the imperfect: thus the less common comes naturally before the more common; as man comes before animal. For the intention of nature does not stop at the generation of animal but goes on to the generation of man.

Reply to Objection 2: The more common universal may be compared to the less common, as the whole, and as the part. As the whole, considering that in the more universal is potentially contained not only the less universal, but also other things, as in "animal" is contained not only "man" but also "horse." As part, considering that the less common contains in its idea not only the more common, but also more; as "man" contains not only "animal" but also "rational." Therefore "animal" in itself comes into our knowledge before "man"; but "man" comes before "animal" considered as part of the same idea.

Reply to Objection 3: A part can be known in two ways. First, absolutely considered in itself; and thus nothing prevents the parts being known before the whole, as stones are known before a house is known. Secondly as belonging to a certain whole; and thus we must needs know the whole before its parts. For we know a house vaguely before we know its different parts. So likewise principles of definition are known before the thing defined is known; otherwise the thing defined would not be known at all. But as parts of the definition they are known after. For we know man vaguely as man before we know how to distinguish all that belongs to human nature.

Reply to Objection 4: The universal, as understood with the intention of universality, is, indeed, in a way, a principle of knowledge, in so far as the intention of universality results from the mode of understanding by way of abstraction. But what is a principle of knowledge is not of necessity a principle of existence, as Plato thought: since at times we know a cause through its effect, and substance through accidents. Wherefore the universal thus considered, according to the opinion of Aristotle, is neither a principle of existence, nor a substance, as he makes clear (Metaph. vii, Did. vi, 13). But if we consider the generic or specific nature itself as existing in the singular, thus in a way it is in the nature of a formal principle in regard to the singulars: for the singular is the result of matter, while the idea of species is from the form. But the generic nature is compared to the specific nature rather after the fashion of a material principle, because the generic nature is taken from that which is material in a thing, while the idea of species is taken from that which is formal: thus the notion of animal is taken from the sensitive part, whereas the notion of man is taken from the intellectual part. Thus it is that the ultimate intention of nature is to the species and not to the individual, or the genus: because the form is the end of generation, while matter is for the sake of the form. Neither is it necessary that, as regards us, knowledge of any cause or principle should be secondary: since at times through sensible causes we become acquainted with unknown effects, and sometimes conversely.

Articulus 3

Argumentum 1

Ad tertium sic proceditur. Videtur quod magis universalia non sint priora in nostra cognitione intellectuali.

Quia ea quae sunt priora et notiora secundum naturam, sunt posteriora et minus nota secundum nos. Sed universalia sunt priora secundum naturam, quia prius est a quo non convertitur subsistendi consequentia. Ergo universalia sunt posteriora in cognitione nostri intellectus.

Argumentum 2

Praeterea, composita sunt priora quoad nos quam simplicia. Sed universalia sunt simpliciora. Ergo sunt posterius nota quoad nos.

Argumentum 3

Praeterea, philosophus dicit, in I physic. Quod definitum prius cadit in cognitione nostra quam partes definitionis.

Sed universaliora sunt partes definitionis minus universalium, sicut animal est pars definitionis hominis. Ergo universalia sunt posterius nota quoad nos.

Argumentum 4

Praeterea, per effectus devenimus in causas et principia. Sed universalia sunt quaedam principia.

Ergo universalia sunt posterius nota quoad nos.

Sed Contra

Sed contra est quod dicitur in I physic., quod ex universalibus in singularia oportet devenire.

Corpus

Respondeo dicendum quod in cognitione nostri intellectus duo oportet considerare. Primo quidem, quod cognitio intellectiva aliquo modo a sensitiva primordium sumit. Et quia sensus est singularium, intellectus autem universalium; necesse est quod cognitio singularium, quoad nos, prior sit quam universalium cognitio. Secundo oportet considerare quod intellectus noster de potentia in actum procedit. Omne autem quod procedit de potentia in actum, prius pervenit ad actum incompletum, qui est medius inter potentiam et actum, quam ad actum perfectum. Actus autem perfectus ad quem pervenit intellectus, est scientia completa, per quam distincte et determinate res cognoscuntur. Actus autem incompletus est scientia imperfecta, per quam sciuntur res indistincte sub quadam confusione, quod enim sic cognoscitur, secundum quid cognoscitur in actu, et quodammodo in potentia.

Unde philosophus dicit, in I physic., quod sunt primo nobis manifesta et certa confusa magis; posterius autem cognoscimus distinguendo distincte principia et elementa.

Manifestum est autem quod cognoscere aliquid in quo plura continentur, sine hoc quod habeatur propria notitia uniuscuiusque eorum quae continentur in illo, est cognoscere aliquid sub confusione quadam. Sic autem potest cognosci tam totum universale, in quo partes continentur in potentia, quam etiam totum integrale, utrumque enim totum potest cognosci in quadam confusione, sine hoc quod partes distincte cognoscantur.

Cognoscere autem distincte id quod continetur in toto universali, est habere cognitionem de re minus communi. Sicut cognoscere animal indistincte, est cognoscere animal inquantum est animal, cognoscere autem animal distincte, est cognoscere animal inquantum est animal rationale vel irrationale, quod est cognoscere hominem vel leonem. Prius igitur occurrit intellectui nostro cognoscere animal quam cognoscere hominem, et eadem ratio est si comparemus quodcumque magis universale ad minus universale.

Et quia sensus exit de potentia in actum sicut et intellectus, idem etiam ordo cognitionis apparet in sensu. Nam prius secundum sensum diiudicamus magis commune quam minus commune, et secundum locum et secundum tempus. Secundum locum quidem, sicut, cum aliquid videtur a remotis, prius deprehenditur esse corpus, quam deprehendatur esse animal; et prius deprehenditur esse animal, quam deprehendatur esse homo; et prius homo, quam socrates vel Plato. Secundum tempus autem, quia puer a principio prius distinguit hominem a non homine, quam distinguat hunc hominem ab alio homine; et ideo pueri a principio appellant omnes viros patres, posterius autem determinant unumquemque, ut dicitur in I physic..

Et huius ratio manifesta est. Quia qui scit aliquid indistincte, adhuc est in potentia ut sciat distinctionis principium; sicut qui scit genus, est in potentia ut sciat differentiam. Et sic patet quod cognitio indistincta media est inter potentiam et actum. Est ergo dicendum quod cognitio singularium est prior quoad nos quam cognitio universalium, sicut cognitio sensitiva quam cognitio intellectiva.

Sed tam secundum sensum quam secundum intellectum, cognitio magis communis est prior quam cognitio minus communis.

Ad 1

Ad primum ergo dicendum quod universale dupliciter potest considerari. Uno modo, secundum quod natura universalis consideratur simul cum intentione universalitatis. Et cum intentio universalitatis, ut scilicet unum et idem habeat habitudinem ad multa, proveniat ex abstractione intellectus, oportet quod secundum hunc modum universale sit posterius.

Unde in I de anima dicitur quod animal universale aut nihil est, aut posterius est.

Sed secundum Platonem, qui posuit universalia subsistentia, secundum hanc considerationem universale esset prius quam particularia, quae secundum eum non sunt nisi per participationem universalium subsistentium, quae dicuntur ideae.

Alio modo potest considerari quantum ad ipsam naturam, scilicet animalitatis vel humanitatis, prout invenitur in particularibus. Et sic dicendum est quod duplex est ordo naturae. Unus secundum viam generationis et temporis, secundum quam viam, ea quae sunt imperfecta et in potentia, sunt priora.

Et hoc modo magis commune est prius secundum naturam, quod apparet manifeste in generatione hominis et animalis; nam prius generatur animal quam homo, ut dicitur in libro de generat. Animal..

Alius est ordo perfectionis, sive intentionis naturae; sicut actus simpliciter est prius secundum naturam quam potentia, et perfectum prius quam imperfectum. Et per hunc modum, minus commune est prius secundum naturam quam magis commune, ut homo quam animal, naturae enim intentio non sistit in generatione animalis, sed intendit generare hominem.

Ad 2

Ad secundum dicendum quod universale magis commune comparatur ad minus commune ut totum et ut pars. Ut totum quidem, secundum quod in magis universali non solum continetur in potentia minus universale, sed etiam alia; ut sub animali non solum homo, sed etiam equus. Ut pars autem, secundum quod minus commune continet in sui ratione non solum magis commune, sed etiam alia; ut homo non solum animal, sed etiam rationale. Sic igitur animal consideratum in se, prius est in nostra cognitione quam homo; sed homo est prius in nostra cognitione quam quod animal sit pars rationis eius.

Ad 3

Ad tertium dicendum quod pars aliqua dupliciter potest cognosci. Uno modo absolute, secundum quod in se est, et sic nihil prohibet prius cognoscere partes quam totum, ut lapides quam domum. Alio modo, secundum quod sunt partes huius totius, et sic necesse est quod prius cognoscamus totum quam partes; prius enim cognoscimus domum quadam confusa cognitione, quam distinguamus singulas partes eius. Sic igitur dicendum est quod definientia, absolute considerata, sunt prius nota quam definitum, alioquin non notificaretur definitum per ea. Sed secundum quod sunt partes definitionis, sic sunt posterius nota, prius enim cognoscimus hominem quadam confusa cognitione, quam sciamus distinguere omnia quae sunt de hominis ratione.

Ad 4

Ad quartum dicendum quod universale, secundum quod accipitur cum intentione universalitatis, est quidem quodammodo principium cognoscendi, prout intentio universalitatis consequitur modum intelligendi qui est per abstractionem. Non autem est necesse quod omne quod est principium cognoscendi, sit principium essendi, ut Plato existimavit, cum quandoque cognoscamus causam per effectum, et substantiam per accidentia. Unde universale sic acceptum, secundum sententiam Aristotelis, non est principium essendi, neque substantia, ut patet in VII metaphys..

Si autem consideremus ipsam naturam generis et speciei prout est in singularibus, sic quodammodo habet rationem principii formalis respectu singularium, nam singulare est propter materiam, ratio autem speciei sumitur ex forma. Sed natura generis comparatur ad naturam speciei magis per modum materialis principii, quia natura generis sumitur ab eo quod est materiale in re, ratio vero speciei ab eo quod est formale; sicut ratio animalis a sensitivo, ratio vero hominis ab intellectivo. Et inde est quod ultima naturae intentio est ad speciem, non autem ad individuum, neque ad genus, quia forma est finis generationis, materia vero est propter formam. Non autem oportet quod cuiuslibet causae vel principii cognitio sit posterior quoad nos, cum quandoque cognoscamus per causas sensibiles, effectus ignotos; quandoque autem e converso.