His appearance at this time was marked. His body was tall and massive, but spare and lean from fasting and labor. His eyes were bright, but their expression was most modest. His face was oblong, his complexion sallow; his forehead depressed, his head large, his person erect.
His first great work was a commentary of about twelve hundred pages on the "Book of Sentences," in the Parma edition, which was received with great admiration for its logical precision, and its opposition to the rationalistic tendencies of the times. In it are discussed all the great theological questions treated by Saint Angustine,—God, Christ, the Holy Spirit, grace, predestination, faith, free-will, Providence, and the like,—blended with metaphysical discussions on the soul, the existence of evil, the nature of angels, and other subjects which interested the Middle Ages. Such was his fame and dialectical skill that he was taken away from his teachings and sent to Rome to defend his Order and the cause of orthodoxy against the slanders of William of Saint Amour, an aristocratic doctor, who hated the Mendicant Friars and their wandering and begging habits. William had written a book called "Perils" in which he exposed the dangers to be apprehended from the new order of monks, in which he proved himself a true prophet, for ultimately the Mendicant Friars became subjects of ridicule and reproach. But the Pope came to the rescue of his best supporters.
On the return of Thomas to Paris he was made doctor of theology, at the same time with Bonaventura the Franciscan, called "the seraphic doctor," between whom and Thomas were intimate ties of friendship. He had now reached the highest honor that the university could bestow, which was conferred with such extraordinary ceremony that it would seem to have been a great event in Paris at that time.
His fame chiefly rests on the ablest treatise written in the Middle Ages,—the "Summa Theologica,"—in which all the great questions in theology and philosophy are minutely discussed, in the most exhaustive manner. He took the side of the Realists, his object being to uphold Saint Augustine. He was, more a Platonist in his spirit than an Aristotelian, although he was indebted to Aristotle for his method. He appealed to both reason and authority. He presented the Christian religion in a scientific form. His book is an assimilation of all that is precious in the thinking of the Church. If he learned many things at Paris, Cologne, and Naples, he was also educated by Chrysostom, by Augustine, and Ambrose. "It is impossible," says Cardinal Newman, and no authority is higher than his, "to read the Catena of Saint Thomas without being struck by the masterly skill with which he put it together. A learning of the highest kind,—not mere literary book knowledge which may have supplied the place of indexes and tables in ages destitute of these helps, and when they had to be read in unarranged and fragmentary manuscripts, but a thorough acquaintance with the whole range of ecclesiastical antiquity, so as to be able to bring the substance of all that had been written on any point to bear upon the text which involved it,—a familiarity with the style of each writer so as to compress in a few words the pith of the whole page, and a power of clear and orderly arrangement in this mass of knowledge, are qualities which make this Catena nearly perfect as an interpretation of Patristic literature." Dr. Vaughan, in eulogistic language, says "The 'Summa Theologica' may be likened to one of the great cathedrals of the Middle Ages, infinite in detail but massive in the grouping of pillars and arches, forming a complete unity that must have taxed the brain of the architect to its greatest extent. But greater as work of intellect is this digest of all theological richness for one thousand years, in which the thread of discourse is never lost sight of, but winds through a labyrinth of important discussions and digressions, all bearing on the fundamental truths which Paul declared and Augustine systematized."
This treatise would seem to be a thesaurus of both Patristic and Mediaeval learning; not a dictionary of knowledge, but a system of truth severely elaborated in every part,—a work to be studied by the Mediaeval students as Calvin's "Institutes" were by the scholars of the Reformation, and not far different in its scope and end; for the Patristic, the Mediaeval, and the Protestant divines did not materially differ in reference to the fundamental truths pertaining to God, the Incarnation, and Redemption. The Catholic and Protestant divines differ chiefly on the ideas pertaining to government and ecclesiastical institutions, and the various inventions of the Middle Ages to uphold the authority of the Church, not on dogmas strictly theological. A student in theology could even in our times sit at the feet of Thomas Aquinas, as he could at the feet of Augustine or Calvin; except that in the theology which Thomas Aquinas commented upon there is a cumbrous method, borrowed from Aristotle, which introduced infinite distinctions and questions and definitions and deductions and ramifications which have no charm to men who have other things to occupy their minds than Scholastic subtilties, acute and logical as they may be. Thomas Aquinas was raised to combat, with the weapons most esteemed in his day, the various forms of Rationalism, Pantheism, and Mysticism which then existed, and were included in the Nominalism of his antagonists. And as long as universities are centres of inquiry the same errors, under other names, will have to be combated, but probably not with the same methods which marked the teachings of the "angelical doctor." In demolishing errors and systematizing truth he was the greatest benefactor to the cause of "orthodoxy" that appeared in Europe for several centuries, admired for his genius as much as Spencer and other great lights of science are in our day, but standing preeminent and lofty over all, like a beacon light to give both guidance and warning to inquiring minds in every part of Christendom. Nor could popes and sovereigns render too great honor to such a prodigy of genius. They offered him the abbacy of Monte Cassino and the archbishopric of Naples, but he preferred the life of a quiet student, finding in knowledge and study, for their own sake, the highest reward, and pursuing his labors without the impedimenta of those high positions which involve ceremonies and cares and pomps, yet which most ambitious men love better than freedom, placidity, and intellectual repose. He lived not in a palace, as he might have lived, surrounded with flatterers, luxuries, and dignities, but in a cell, wearing his simple black gown, and walking barefooted wherever he went, begging his daily bread according to the rules of his Order. His black gown was not an academic badge, but the Dominican dress. His only badge of distinction was the doctors' cap.
Dr. Vaughan, in his heavy and unartistic life of Thomas Aquinas, has drawn a striking resemblance between Plato and the Mediaeval doctor: "Both," he says, "were nobly born, both were grave from youth, both loved truth with an intensity of devotion. If Plato was instructed by Socrates, Aquinas was taught by Albertus Magnus; if Plato travelled into Italy, Greece, and Egypt, Aquinas went to Cologne, Naples, Bologna, and Rome; if Plato was famous for his erudition, Aquinas was no less noted for his universal knowledge. Both were naturally meek and gentle; both led lives of retirement and contemplation; both loved solitude; both were celebrated for self-control; both were brave; both held their pupils spell-bound by their brilliant mental gifts; both passed their time in lecturing to the schools (what the Pythagoreans were to Plato, the Benedictines were to the angelical); both shrank from the display of self; both were great dialecticians; both reposed on eternal ideas; both were oracles to their generation." But if Aquinas had the soul of Plato, he also had the scholastic gifts of Aristotle, to whom the Church is indebted for method and nomenclature as it was to Plato for synthesis and that exalted Realism which went hand in hand with Christianity. How far he was indebted to Plato it is difficult to say. He certainly had not studied his dialectics through translations or in the original, but had probably imbibed the spirit of this great philosopher through Saint Augustine and other orthodox Fathers who were his admirers.
Although both Plato and Aristotle accepted "universals" as the foundation of scientific inquiry, the former arrived at them by consciousness, and the other by reasoning. The spirit of the two great masters of thought was as essentially different as their habits and lives. Plato believed that God governed the world; Aristotle believed that it was governed by chance. The former maintained that mind is divine and eternal; the latter that it is a form of the body, and consequently mortal. Plato thought that the source of happiness was in virtue and resemblance to God; while Aristotle placed it in riches and outward prosperity. Plato believed in prayer; but Aristotle thought that God would not hear or answer it, and therefore that it was useless. Plato believed in happiness after death; while Aristotle supposed that death ended all pleasure. Plato lived in the world of abstract ideas; Aristotle in the realm of sense and observation. The one was religious; the other secular and worldly. With both the passion for knowledge was boundless, but they differed in their conceptions of knowledge; the one basing it on eternal ideas and the deductions to be drawn from them, and the other on physical science,—the phenomena of Nature,—those things which are cognizable by the senses. The spiritual life of Plato was "a longing after love and of eternal ideas, by the contemplation of which the soul sustains itself and becomes participant in immortality." The life of Aristotle was not spiritual, but intellectual. He was an incarnation of mere intellect, the architect of a great temple of knowledge, which received the name of Organum, or the philosophy of first principles.
Thomas Aquinas, we may see from what has been said, was both Platonic and Aristotelian. He resembled Plato in his deep and pious meditations on the eternal realities of the spiritual world, while in the severity of his logic he resembled Aristotle, from whom he learned precision of language, lucidity of statement, and a syllogistic mode of argument well calculated to confirm what was already known, but not to make attainments in new fields of thought or knowledge. If he was gentle and loving and pious like Plato, he was also as calm and passionless as Aristotle.
This great man died at the age of forty-eight, in the year 1274, a few years after Saint Louis, before his sum of theology was completed. He died prematurely, exhausted by his intense studies; leaving, however, treatises which filled seventeen printed folio volumes,—one of the most voluminous writers of the world. His fame was prodigious, both as a dialectician and a saint, and he was in due time canonized as one of the great pillars of the Church, ranking after Chrysostom, Jerome, Augustine, and Gregory the Great,—the standard authority for centuries of the Catholic theology.
The Scholastic Philosophy, which culminated in Thomas Aquinas, maintained its position in the universities of Europe until the Reformation, but declined in earnestness. It descended to the discussion of unimportant and often frivolous questions. Even the "angelical doctor" is quoted as discussing the absurd question as to how many angels could dance together on the point of a needle. The play of words became interminable. Things were lost sight of in a barbarous jargon about questions which have no interest to humanity, and which are utterly unintelligible. At the best, logical processes can add nothing to the ideas from which they start. When these ideas are lofty, discussion upon them elevates the mind and doubtless strengthens its powers. But when the subjects themselves are frivolous, the logical tournaments in their defence degrade the intellect and narrow it. Nothing destroys intellectual dignity more effectually than the waste of energies in the defence of what is of no practical utility, and which cannot be applied to the acquisition of solid knowledge. Hence the Scholastic Philosophy did not advance knowledge, since it did not seek the acquisition of new truths, but only the establishment of the old. Its utility consisted in training the human mind to logical reasonings. It exercised the intellect and strengthened it, as gymnastics do the body, without enlarging it. It was nothing but barren dialectics,—"dry bones," a perpetual fencing. The soul cries out for bread; the Scholastics gave it a stone.