Yet while he ruled tyrannically, his private life was above reproach. His habits were simple and his tastes were cultivated. He was charitable and kind to the poor and unfortunate. He spent his enormous revenues in building churches, endowing hospitals, and rewarding learned men; and otherwise showed himself the friend of scholars, and the patron of benevolent movements. He was a reformer of abuses, publishing the most severe acts against venality, and deciding quarrels on principles of justice. He had no dramatic conflicts like Hildebrand, for his authority was established. As the supreme guardian of the interests of the Church he seldom made demands which he had not the power to enforce. John of England attempted resistance, but was compelled to submit. Innocent even gave the archbishopric of Canterbury to one of his cardinals, Stephen Langton, against the wishes of a Norman king. He took away the wife of Philip Augustus; he nominated an emperor to the throne of Constantine; he compelled France to make war on England, and incited the barons to rebellion against John. Ten years' civil war in Germany was the fruit of his astute policy, and the only great failure of his administration was that he could not exempt Italy from the dominion of the Emperors of Germany, thus giving rise to the two great political parties of the thirteenth and fourteenth centuries,--the Guelphs and Ghibellines.

To cement his vast spiritual power he encouraged what doubtless seemed even to him a great fanaticism, but which he found could be turned to his advantage,--that of the Mendicant Friars, established by Saint Francis of Assisi, and Saint Dominic of the great family of the Guzmans in Spain. These men made substantially the same offers to the Pope that Ignatius Loyola did in after times,--to go where they were sent as teachers, preachers, and missionaries without condition or reward. They renounced riches, professed absolute poverty, and wandered from village to city barefooted, and subsisting entirely on alms as beggars. The Dominican friar in his black habit, and the Franciscan in his gray, became the ablest and most effective preachers of the thirteenth century. The Dominicans confined their teachings to the upper classes, and became their favorite confessors. They were the most learned men of the thirteenth century, and also the most reproachless in morals. The Franciscans were itinerary preachers to the common people, and created among them the same religious revival that the Methodists did later in England under the guidance of Wesley. The founder of the Franciscans was a man who seemed to be "inebriated with love," so unquenchable was his charity, rapt his devotions, and supernal his sympathy. He found his way to Rome in the year 1215, and in twenty-two years after his death there were nine thousand religious houses of his Order. In a century from his death the friars numbered one hundred and fifty thousand. The increase of the Dominicans was not so rapid, but more illustrious men belonged to this institution. It is affirmed that it produced seventy cardinals, four hundred and sixty bishops, and four popes.

It was in the palmy days of these celebrated monks, before corruption had set in, that the Dominican Order was recruited with one of the most extraordinary men of the Middle Ages. This man was Saint Thomas, born 1225 or 1227, son of a Count of Aquino in the kingdom of Naples, known in history as Thomas Aquinas, "the most successful organizer of knowledge," says Archbishop Trench, "the world has known since Aristotle." He was called "the angelical doctor," exciting the enthusiasm of his age for his learning and piety and genius alike. He was a prodigy and a marvel of dialectical skill, and Catholic writers have exhausted language to find expressions for their admiration. Their Lives of him are an unbounded panegyric for the sweetness of his temper, his wonderful self-control, his lofty devotion to study, his indifference to praises and rewards, his spiritual devotion, his loyalty to the Church, his marvellous acuteness of intellect, his industry, and his unparalleled logical victories. When he was five years of age his father, a noble of very high rank, sent him to Monte Cassino with the hope that he would become a Benedictine monk, and ultimately abbot of that famous monastery, with the control of its vast revenues and patronage. Here he remained seven years, until the convent was taken and sacked by the soldiers of the Emperor Frederic in his war with the Pope. The young Aquino returned to his father's castle, and was then sent to Naples to be educated at the university, living in a Benedictine abbey, and not in lodgings like other students. The Dominicans and Franciscans held chairs in the university, one of which was filled with a man of great ability, whose preaching and teaching had such great influence on the youthful Thomas that he resolved to join the Order, and at the age of seventeen became a Dominican friar, to the disappointment of his family. His mother Theodora went to Naples to extricate him from the hands of the Dominicans, who secretly hurried him off to Rome and immured him in their convent, from which he was rescued by violence. But the youth persisted in his intentions against the most passionate entreaties of his mother, made his escape, and was carried back to Naples. The Pope, at the solicitation of his family, offered to make him Abbot of Monte Cassino, but he remained a poor Dominican. His superior, seeing his remarkable talents, sent him to Cologne to attend the lectures of Albertus Magnus, then the most able expounder of the Scholastic Philosophy, and the oracle of the universities, who continued his lectures after he was made a bishop, and even until he was eighty-five. When Albertus was transferred from Cologne to Paris, where the Dominicans held two chairs of theology, Thomas followed him, and soon after was made bachelor. Again was Albert sent back to Cologne, and Thomas was made his assistant professor. He at once attracted attention, was ordained priest, and became as famous for his sermons as for his lectures. After four years at Cologne Thomas was ordered back to Paris, travelling on foot, and begging his way, yet stopping to preach in the large cities. He was still magister and Albert professor, but had greatly distinguished himself by his lectures.

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 Augustine,--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.