This Prologue indicates sufficiently the order of topics in the Pars tertia of the Summa, through Quaestio xc., at which point the hand of the Angelic Doctor was folded to eternal rest. He was then considering penance, the fourth in his order of Sacraments. All that he had to say as to the person, and attributes, and acts and passion of Christ had been written; and he had considered the Sacraments of baptism, confirmation, and the eucharist; he was occupied with poenitentia; and still other sacraments remained, as well as his final treatment of the matters which lie beyond the grave. So he left his work unfinished, and, in spite of many efforts, unfinishable by any of his pupils or successors.[451]
II
Inasmuch as the matter of their thoughts was transmitted to the men of the Middle Ages, and was not drawn from their own observation or constructive reasoning, the fundamental intellectual endeavour for mediaeval men was to apprehend and make their own, and re-express. Their intellectual progress followed this process of appropriation, and falls into three stages—learning, organically appropriating, and re-expressing with added elements of thought. Logically, and generally in time, these three stages were successive. Yet, of course, they overlapped, and may be observed progressing simultaneously. Thus, for example, what was known of Aristotle at the beginning of the twelfth century was slight compared with the knowledge of his philosophy that was opened to western Europe in the latter part of the twelfth and the beginning of the thirteenth. And while, by the middle of the twelfth century, the elements of Aristotle’s logic had been thoroughly appropriated, the substantial Aristotelian philosophy had still to be learned and mastered, before it could be reformulated and re-expressed as part of mediaeval thought.
Looking solely to the outer form, the three stages of mediaeval thought are exemplified in the Scriptural Commentary of the later Carolingian time, in the twelfth-century Books of Sentences, and at last in the more organic Summa theologiae. With this significant evolution and change of outer form, proceeded the more substantial evolution consisting in learning, appropriating, and re-expressing the inherited material. In both cases, these three stages were necessitated by the greatness of the transmitted matter; for the intellectual energies of the mediaeval period were fully occupied with mastering the data proffered so pressingly, with presenting and re-presenting this superabundant material, and recasting it in new forms of statement, which were also expressions, or realizations, of the mediaeval genius. So the mediaeval product may be regarded as given by the past, and by the same token necessitated and controlled. But, on the other hand, each stage of intellectual progress rendered possible the next one.
The first stage of learning is represented by the Carolingian period, which we have considered. It was then that the patristic material was extracted from the writings of the Fathers, and rearranged and reapplied, to meet the needs of the time. The mastery of this material had scarcely made such vital progress as to enable the men of the ninth and tenth and eleventh centuries to re-express it largely in terms of their own thinking. In the ninth century, Eriugena affords an extraordinary exception with his drastic restatement of what he had drawn from Pseudo-Dionysius and others; and at the end comes Anselm, whose genius is metaphysically constructive. But Anselm touches the coming time; and the springs of Eriugena’s genius are hidden from us.
As for the antique thought during these Carolingian centuries, Eriugena dealt in his masterful way with what he knew of it through patristic and semi-patristic channels. But let us rather seek it in the curriculum of the Trivium and Quadrivium. What progress Gerbert made in the Quadrivium, that is, in the various branches of mathematics which he taught, has been noted, and to what extent his example was followed by his pupil Fulbert, at the cathedral school of Chartres.[452] The courses of the Trivium—grammar, rhetoric, logic—demand our closer attention; for they were the key of the situation. We must keep in mind that we are approaching mediaeval thought from the side of the innate human need of intellectual expression—the impulse to know and the need to formulate one’s conceptions and express them consistently. For mediaeval men the first indispensable means to this end was grammar, including rhetoric, and the next was logic or dialectic. The Latin language contained the sum of knowledge transmitted to the Middle Ages. And it had to be learned. This was true even in Italy and Spain and France, where each year the current ways of Romance speech were departing more definitely from the parent stock; it was more patently true in the countries of Teutonic speech. Centuries before, the Roman youth had studied grammar that they might speak and write correctly. Now it was necessary to study Latin grammar, to wit, the true forms and literary usages of the Latin tongue, in order to acquire any branch of knowledge whatsoever, and express one’s corresponding thoughts. And men would not at first distinguish sharply between the mediating value of the learned tongue and the learning which it held.[453]
Thus grammar, the study of the Latin language, represented the first stage of knowledge for mediaeval men. This was to remain true through all the mediaeval centuries; since all youths who became scholars had to learn the language before they could study what was contained in it alone. One may also say, and yet not speak fantastically, that grammar, the study of the correct use of the language itself, corresponded spiritually with the main intellectual labour of the Carolingian period. Alcuin’s attention is commonly fixed upon the significance of language, Latin of course. And the labours of his pupil Rabanus, and the latter’s pupil Walafrid, are as it were devoted to the grammar of learning. That is to say, they read and endeavour to understand the works of the Fathers; they compare and collate, and make volumes of extracts, which they arrange for the most part as Scripture commentaries; commentaries, that is, upon the significance of the canonical writings which were the substance of all wisdom, but needed much explication. Such works were the very grammar of knowledge, being devoted to the exposition of the meaning of the Scriptures and the vast burden of patristic thought. A like purpose was evinced in the efforts of the great emperor himself to re-establish schools of grammar, in order that the Scriptures might be more correctly understood, and the expositions of the holy Fathers. In fine, just as knowledge of the Latin tongue was the end and aim of grammar, so a correct understanding of what was contained in Latin books was the aim of the intellectual labours of this period. It all represented the first stage in the mediaeval acquisition of knowledge, or in the presentation or expression of the same; and thus the first stage in the mediaeval endeavour to realize the human impulse to know.
The next course of the Trivium was logic; and likewise its study will represent truly the second stage in the mediaeval realization of the human impulse to know, to wit, the second stage in the appropriation and expression of the knowledge transmitted from the past. We have spoken at some length of the logical studies of Gerbert, and his endeavours to adjust his thinking and classify the branches of knowledge by means of formal logic.[454] Those discussions of his which seem somewhat puerile to us, were essential to his endeavours to formulate what he had learned, and present it as rational and ordered knowledge. Logic is properly the stage succeeding grammar in the formulation of rational knowledge. At least it was for men of Gerbert’s time, and the following centuries. Rightly enough they looked on logic as a scientia sermotionalis, which on one side touched sheer linguistics, and on the other, had for its field the further processes of reason. Thus Hugo of St. Victor, Abaelard’s very great contemporary, says:
“Logic is named from the Greek word logos, which has a twofold interpretation. For logos means either sermo or ratio; and therefore logic may be termed either a scientia sermotionalis or a scientia rationalis. Logica rationalis embraces dialectic and rhetoric, and is called discretiva (argumentative and exercising judgment); logica sermotionalis is the genus which includes grammar, dialectic and rhetoric, to wit, discursive science (disertiva).”[455]
The close connection between grammar and logic is evident. Logic treats of language used in rational expression, as well as of the reasoning processes carried on in language. Its elementary chapters teach a rational use of language, whereby men may reach a more deeply consistent expression of their thoughts than is gained from grammar. Yet grammar also is logic, and based on logical principles. All this is exemplified in the logical treatises composing the Aristotelian Organon, which the Middle Ages used. First comes Porphyry’s Isagoge, which clearly is bound up in language. Likewise Aristotle’s Categories treat of the rational and consistent use of language, or of what may be stated in language. Next it is obvious that the De interpretatione treats of language used to express thought, its generic function. The more advanced treatises of the Organon, the Prior and Posterior Analytics, the Topics, and Sophistical Elenchi, treat directly and elaborately of the reasoning processes themselves. So one perceives the grammatical affinities of the simpler treatises in the Organon. The more advanced ones seem to stand to them as oratorical rhetoric stands to elementary grammar. For the Analytics, Topics, and Sophistical Elenchi are a kind of eristic, training the student to use the processes of thought and their expression in order to attain an end, commonly argumentative. The prior treatises have taught the elements, as it were the orthography and etymology of the rational expression of thought in language; the latter (even as syntax and rhetoric), train the student in the use of these elements. And one observes a nice historical fitness in the fact that only the simpler treatises of the Organon were in common use in the early Middle Ages, since they alone were necessary to the first stage in the appropriation of the substance of patristic and antique thought. The full Organon was rediscovered, and retaken into use in the middle or latter part of the twelfth century, when men had progressed to a more organic appropriation of the patristic material and what they knew of the antique philosophy.