Extract from the Catholic Encyclopedia on arguably the Church's greatest scholar:
It is not possible to characterize the method of St. Thomas by one word, unless it can be called eclectic. It is Aristotelean, Platonic, and Socratic; it is inductive and deductive; it is analytic and synthetic. He chose the best that could he found in those who preceded him, carefully sifting the chaff from the wheat, approving what was true, rejecting the false. His powers of synthesis were extraordinary. No writer surpassed him in the faculty of expressing in a few well-chosen words the truth gathered from a multitude of varying and conflicting opinions; and in almost every instance the student sees the truth and is perfectly satisfied with St. Thomas's summary and statement. Not that he would have students swear by the words of a master. In philosophy, he says, arguments from authority are of secondary importance; philosophy does not consist in knowing what men have said, but in knowing the truth (In I lib. de Coelo, lect. xxii; II Sent., D. xiv, a. 2, ad 1um). He assigns its proper place to reason used in theology (see below: Influence of St. Thomas), but he keeps it within its own sphere. Against the Traditionalists the Holy See has declared that the method used by St. Thomas and St. Bonaventure does not lead to Rationalism (Denzinger-Bannwart, n. 1652). Not so bold or original in investigating nature as were Albertus Magnus and Roger Bacon, he was, nevertheless, abreast of his time in science, and many of his opinions are of scientific value in the twentieth century. Take, for instance, the following: "In the same plant there is the two-fold virtue, active and passive, though sometimes the active is found in one and the passive in another, so that one plant is said to be masculine and the other feminine" (3 Sent., D. III, Q. ii, a 1).
The style of St. Thomas is a medium between the rough expressiveness of some Scholastics and the fastidious elegance of John of Salisbury; it is remarkable for accuracy, brevity, and completeness. Pope Innocent VI (quoted in the Encyclical, "Aeterni Patris", of Leo XIII) declared that, with the exception of the canonical writings, the works of St. Thomas surpass all others in "accuracy of expression and truth of statement" (habet proprietatem verborum, modum dicendorum, veritatem sententiarum). Great orators, such as Bossuet, Lacordaire, Monsabré, have studied his style, and have been influenced by it, but they could not reproduce it. The same is true of theological writers. Cajetan knew St. Thomas's style better than any of his disciples, but Cajetan is beneath his great master in clearness and accuracy of expression, in soberness and solidity of judgment. St. Thomas did not attain to this perfection without an effort. He was a singularly blessed genius, but he was also an indefatigable worker, and by continued application he reached that stage of perfection in the art of writing where the art disappears. "The author's manuscript of the Summa Contra Gentiles is still in great part extant. It is now in the Vatican Library. The manuscript consists of strips of parchment, of various shades of colour, contained in an old parchment cover to which they were originally stitched. The writing is in double column, and difficult to decipher, abounding in abbreviations, often passing into a kind of shorthand. Throughout many passages a line is drawn in sign of erasure" (Rickaby, Op. cit., preface: see Ucelli ed., "Sum. cont. gent.", Rome, 1878).
III. INFLUENCES EXERTED ON ST. THOMAS
How was this great genius formed? The causes that exerted an influence on St. Thomas were of two kinds, natural and supernatural.
A. Natural Causes
(1) As a foundation, he "was a witty child, and had received a good soul" (Wisdom 8:19). From the beginning he manifested precocious and extraordinary talent and thoughtfulness beyond his years.
(2) His education was such that great things might have been expected of him. His training at Monte Cassino, at Naples, Paris, and Cologne was the best that the thirteenth century could give, and that century was the golden age of education. That it afforded excellent opportunities for forming great philosophers and theologians is evident from the character of St. Thomas's contemporaries. Alexander of Hales, Albertus Magnus, St. Bonaventure, St. Raymond of Pennafort, Roger Bacon, Hugo a S. Charo, Vincent of Beauvais, not to mention scores of others, prove beyond all doubt that those were days of really great scholars. (See Walsh, "The Thirteenth, Greatest of Centuries", New York, 1907.) The men who trained St. Thomas were his teachers at Monte Cassino and Naples, but above all Albertus Magnus, under whom he studied at Paris and Cologne.
(3) The books that exercised the greatest influence on his mind were the Bible, the Decrees of the councils and of the popes, the works of the Fathers, Greek and Latin, especially of St. Augustine, the "Sentences" of Peter Lombard, the writings of the philosophers, especially of Plato, Aristotle, and Boethius. If from these authors any were to be selected for special mention, undoubtedly they would be Aristotle, St. Augustine, and Peter Lombard. In another sense the writings of St. Thomas were influenced by Averroes, the chief opponent whom he had to combat in order to defend and make known the true Aristotle.
(4) It must be borne in mind that St. Thomas was blessed with a retentive memory and great powers of penetration. Father Daniel d'Agusta once pressed him to say what he considered the greatest grace he had ever received, sanctifying grace of course excepted. "I think that of having understood whatever I have read", was the reply. St. Antoninus declared that "he remembered everything be had read, so that his mind was like a huge library" (cf. Drane, op. cit., p. 427; Vaughan, op. cit., II, p. 567). The bare enumeration of the texts of Scripture cited in the "Summa theologica" fills eighty small-print columns in the Migne edition, and by many it is not unreasonably supposed that he learned the Sacred Books by heart while he was imprisoned in the Castle of San Giovanni. Like St. Dominic he had a special love for the Epistles of St. Paul, on which he wrote commentaries (recent edition in 2 vols., Turin, 1891).
(5) Deep reverence for the Faith, as made known by tradition, characterizes all his writings. The consuetudo ecclesiae -- the practice of the Church -- should prevail over the authority of any doctor (Summa II-II:10:12). In the "Summa" he quotes from 19 councils, 41 popes, and 52 Fathers of the Church. A slight acquaintance with his writings will show that among the Fathers his favourite was St. Augustine (on the Greek Fathers see Vaughan, op. cit., II, cc. iii sqq.).
(6) With St. Augustine (II De doctr. Christ., c. xl), St. Thomas held that whatever there was of truth in the writings of pagan philosophers should be taken from them, as from "unjust possessors", and adapted to the teaching of the true religion (Summa I:84:5). In the "Summa" alone he quotes from the writings of 46 philosophers and poets, his favourite authors being Aristotle, Plato, and, among Christian writers, Boethius. From Aristotle he learned that love of order and accuracy of expression which are characteristic of his own works. From Boethius he learned that Aristotle's works could be used without detriment to Christianity. He did not follow Boethius in his vain attempt to reconcile Plato and Aristotle. In general the Stagirite was his master, but the elevation and grandeur of St. Thomas's conceptions and the majestic dignity of his methods of treatment speak strongly of the sublime Plato.
B. Supernatural Causes
Even if we do not accept as literally true the declaration of John XXII, that St. Thomas wrought as many miracles as there are articles in the "Summa", we must, nevertheless, go beyond causes merely natural in attempting to explain his extraordinary career and wonderful writings.
(1) Purity of mind and body contributes in no small degree to clearness of vision (see St. Thomas, "Commentaries on I Cor., c. vii", Lesson v). By the gift of purity, miraculously granted at the time of the mystic girdling, God made Thomas's life angelic; the perspicacity and depth of his intellect, Divine grace aiding, made him the "Angelic Doctor".
(2) The spirit of prayer, his great piety and devotion, drew down blessings on his studies. Explaining why he read, every day, portions of the "Conferences" of Cassian, he said: "In such reading I find devotion, whence I readily ascend to contemplation" (Prümmer, op. cit., p. 32). In the lessons of the Breviary read on his feast day it is explicitly stated that he never began to study without first invoking the assistance of God in prayer; and when he wrestled with obscure passages of the Scriptures, to prayer he added fasting.
(3) Facts narrated by persons who either knew St. Thomas in life or wrote at about the time of his canonization prove that he received assistance from heaven. To Father Reginald he declared that he had learned more in prayer and contemplation than he had acquired from men or books (Prümmer, op. cit., p. 36). These same authors tell of mysterious visitors who came to encourage and enlighten him. The Blessed Virgin appeared, to assure him that his life and his writings were acceptable to God, and that he would persevere in his holy vocation. Sts. Peter and Paul came to aid him in interpreting an obscure passage in Isaias. When humility caused him to consider himself unworthy of the doctorate, a venerable religious of his order (supposed to be St. Dominic) appeared to encourage him and suggested the text for his opening discourse (Prümmer, op. cit., 29, 37; Tocco in "Acta SS.", VII Mar.; Vaughan, op. cit., II, 91). His ecstasies have been mentioned. His abstractions in presence of King Louis IX (St. Louis) and of distinguished visitors are related by all biographers. Hence, even if allowance be made for great enthusiasm on the part of his admirers, we must conclude that his extraordinary learning cannot be attributed to merely natural causes. Of him it may truly be said that he laboured as if all depended on his own efforts and prayed as if all depended on God.
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