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The Philosophy of Thomas Aquinas

TABLE OF CONTENTS

I.
II.
III.
IV.
V.
VI.
VII.
VIII.
IX.

The Life of Thomas Aquinas
The Works of Thomas Aquinas
An Introduction to His Doctrine
Theory of Knowledge (Epistemology)
General Metaphysics
The Existence of God (Theodicy)
The World (Cosmology)
The Human Soul (Rational Psychology)
Ethics and Politics


For a more advanced & comprehensive discussion, see:
The Philosophical System of Thomas Aquinas, by Maurice de Wulf


I. The Life of Thomas Aquinas --1225-1274

The "Angelic Doctor"

 

Thomas Aquinas (picture), born of a noble family in Rocca Secca, near Aquino in 1225, was to complete the magnificent synthesis of Scholasticism.

As a very young boy, he went to Monte Cassino, the celebrated Benedictine monastery which at the time was headed by one of his uncles. He displayed such brilliance that the monks advised his father to send him to the University of Naples, where he could receive a more advanced education.

While in Naples, he entered the Dominican Order. His mother, far from favorable to this move, hastened to Naples; but the Dominicans, fearing her opposition, had already send Thomas to Rome in the hope that he would eventually be able to reach Paris or Cologne.

His brothers captured him on the road and held him prisoner in the fortress of San Giovanni at Rocca Secca, where he remained almost two years while his family tried to dissuade him from following his vocation.

Finally released, he was sent to Rome, then to Paris and Cologne where he studied in the school of Albertus Magnus. There he was introduced to the study of Aristotelianism and completed his theological studies.

In 1252, Thomas Aquinas was sent to Paris to further his studies and then to teach, which he continued to do until 1260. In that year he returned to the Roman province of his Order, where he was given various offices of administration and education in the province.

In 1269 he was again in Paris, where he carried on the controversy against the Averroism of Siger of Brabant. In 1272 he went to Naples to assume the chair of theology at the university there. At the beginning of 1274 he set out with a companion for the Council of Lyons, but died en route, at the Cistercian monastery of Fossa Nuova near Terracina, on March 7, at the early age of forty-nine. He was proclaimed a saint by the Church, and by posterity has been acclaimed as the Angelic Doctor.


II. The Works of Thomas Aquinas

The works of Thomas Aquinas may be conveniently divided into four groups:

1. COMMENTARIES

  • on the Logic, Physics, Metaphysics, and Ethics of Aristotle;
  • on the Scriptures;
  • on Dionysius the Areopagite;
  • on the Four Books of Sentences of Peter Lombard.

2. SUMMAE

  • The Summa contra Gentiles (A Summary Against the Gentiles), founded substantially on rational demonstration;
  • The Summa Theologica (A Summary of Theology), begun in 1265, and remaining incomplete because of Thomas' early death.

3. QUESTIONS

  • Quaestiones Disputatae (Disputed Questions): De Veritate (On Truth), De Anima (On the Soul), De Potentia (On Power), De Malo (On Evil), etc.;
  • Quaestiones Quodlibetales (Questions About Any Subject).

4. OPUSCULA (selected examples)

  • De Ente et Essentia (On Being and Essence);
  • De Unitate Intellectus (On the Unity of the Intellect), written against the Averroists;
  • De Regimine Principum (On the Rule of Princes).


III. An Introduction to His Doctrine

Thomas Aquinas was the first to recognize the fact that Aristotelian intellectualism would be of great help for the study of philosophy as well as theology. But the introduction of Aristotle's works involved the solution of the disputed question of the relationship between philosophy and theology.

At the time of Aquinas, besides the Averroist theory of the double truth, by virtue of which philosophy and theology were not only separate but opposed, there was also Augustinianism, which was largely accepted in the School and held that no real distinction between philosophy and theology was possible.

This confusion between philosophy and theology was a necessary consequence of the theory of illumination, according to which the human intellect was considered incapable of abstracting intelligibles from the data of experience, but rather received them from the Divine Teacher.

This Teacher communicated to the intellect the intelligibles regarding the material things of the surrounding world as well as those concerning the invisible and supernatural world. Thus the human intellect was capable of understanding not only material things but also the mysteries of religion. Hence no distinction between philosophy and theology was possible.

Thomas Aquinas sharply opposed both Averroism and Augustinianism. He did not accept the theory of the double truth, not only because of its irreligious consequences regarding the mortality of the human soul, but because he was convinced of the falsity of such a theory.

For Aquinas, what reason shows to be true is absolutely true, so that the opposite is absolutely false and impossible. (1)

If religion, therefore, teaches something that is opposed to reason, as the Averroists maintained it does, it would teach what is absolutely false and impossible.

Two contradictory truths cannot be admitted; truth is one, either in the field of reason or of religion. The two fields are separate but not opposed. There are religious truths -- such as the mystery of the Trinity and the Incarnation -- which the human intellect cannot penetrate; and these truths must accepted on the authority of revelation.

Parallel to them, there are natural truths concerning this visible world which are intelligible to the human mind and are the object of philosophy and science.

To the question whether there also some truths which at the same time are revealed and open to rational demonstration, Aquinas answers yes. Such truths are the existence of God and the immortality of the human soul, which are demonstrable by reason. God revealed them, however, in order to make these truths accessible to the minds of those who cannot attain philosophical investigation. (2)

But Aquinas also opposed Augustinian illumination. Granting that the human soul is intellectual by nature, he maintains that the human intellect by its natural power is able to draw the intelligibles from material objects. Besides its own natural power, the human intellect does not need any special divine assistance in abstracting the intelligibles from the data of experience.

Indeed, if Aristotle, a pagan philosopher, could establish a systematic and rational interpretation of the visible world, we must admit that the human intellect has the power of knowing some fundamental principles and is capable of drawing therefrom a perfect science without divine assistance.

Moreover, since with Aristotle we know what rational demonstration means, we can see how vain is the assumption of the Augustinians that the mysteries of faith can be demonstrated "by means of necessity."

The truths of faith are above human understanding. They are the object of faith and not of science. Hence philosophy and theology are distinct and this distinction must be retained.

Although distinct, they are related. Philosophy shows the necessity of faith by demonstrating the existence of God and the immortality of the soul. Theology on the other hand helps philosophy to reflect more deeply and to correct itself if some philosophical conclusion is contrary to the mysteries of faith. (3)

References:

(1) Contra Gent., I, 7.
(2) Summa. Theol., Part I, q. I, a.1.
(3) Summa Theol., Part I, q 1, a. 1; q. 12, a. 4; q. 32, a. 1; In Primum Librum Sent., q. 1, a. 1 and 2.

 

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