Practical intellect
| Latin | intellectus practicus |
|---|---|
| Locus in Aquinas | Summa theologiae I, q. 79, a. 11; I–II, q. 94, a. 2 |
| Branch | Moral psychology |
| Controlling authority | Catechism 1776–1806 and 1954–1960; Veritatis Splendor; Thomistic synthesis |
| Doctrinal standing | Conscience and practical reason under the moral law are doctrine; the identity of speculative and practical as one power is school psychology |
| School | Thomism |
Practical intellect is, in Thomism, the same intellectual power as the speculative, considered as ordering what it knows toward action and the good to be done.[1]
One power, two tasks
Summa theologiae I, question 79, article 11, asks whether speculative and practical intellect are distinct powers. They are not. Powers are distinguished by the formal aspect of their objects. The intellect regards being. The practical intellect regards the same being as to be done, as ordered to an end. The difference is the end of the act of knowing, not a second organ. The 1913 article on intellect notes the same: when the intellect considers harmony with action, it is termed practical, yet the faculty is one.[1]
A builder's knowledge of a house measures the house he causes. Speculative knowledge of natural things is measured by those things. Practical intellect is therefore a measure of artifacts and of chosen acts, while remaining measured by the real good and by the eternal law. It is not a license to invent the good. It is reason in the imperative mood.[2]
First precepts, prudence, and conscience
Question 94, article 2, of the Prima secundae places in practical reason the first precept that good is to be done and evil avoided, with further precepts following natural inclinations. Synderesis is the habit of those first practical principles. Conscience is the act that applies them to a particular case. Catechism 1776–1802 treats conscience as a judgment of reason, not as a private oracle. Prudence is the virtue that commands right action in the contingent particular, joining the universal to the here and now.[3]
Veritatis Splendor insists that there are intrinsically evil acts which no good intention can make good. Practical intellect therefore includes knowledge of moral species, not only calculation of outcomes. Object, end, and circumstances all enter the judgment, as question 18 of the Prima secundae analyzes. A reason that only weighs consequences has ceased to be practical in the Thomistic sense and has become a technique.[4][5]
Will, passion, and the need of virtue
Practical intellect does not move unless the will wills. Conversely, the will does not choose well unless reason presents the true good. Passions can bind application without erasing first principles, which is why a man can know the better and do the worse. Moral virtues rectify appetite so that the particular judgment of prudence is not shouted down. Infused prudence, in the school account, further proportionates this judgment to the supernatural end.[6]
The Catechism's treatment of the cardinal virtues places prudence as the guide of the others. That is Catholic doctrine at the level of the fourfold scheme and of conscience. The exact identity of practical intellect with speculative intellect as one power remains theology. Ordinary speech may call it simply reason about what to do. It is not a feeling that creates right.[6]
School identity under a binding moral reason
The Church binds the faithful to a real moral law, to conscience as a judgment of reason, and to the need of grace for a supernatural fulfillment of that law. She has not defined intellectus practicus. Thomism's claim that it is the same power as the speculative protects the unity of truth: the God known in doctrine is the God obeyed in action. Split the powers into two natures, and faith and morals become two religions.[2]
Humani Generis and Veritatis Splendor together refuse a practical reason that has no access to being and a speculative reason that never judges the good. The Thomistic practical intellect is the Catholic refusal of both. Counsel, choice, and command remain human acts. They remain true or false. They remain in need of the last end, which no technique supplies.[4]
References
- Back to citation occurrence 1.0 Back to citation occurrence 1.1 Thomas Aquinas, Summa theologiae I, question 79 — Primary treatment of the intellectual powers, including the possible intellect, the agent intellect as a power in the soul, speculative and practical intellect, and synderesis.
- Back to citation occurrence 2.0 Back to citation occurrence 2.1 Catechism of the Catholic Church, 1949–1986 — Authoritative teaching on eternal, natural, revealed, and human law, their order, and the New Law as the grace of the Holy Spirit in Christ.
- Back to citation Thomas Aquinas, Summa theologiae I–II, question 94, article 2 — Primary statement of the first precepts of natural law and of the first indemonstrable principles of speculative and practical reason.
- Back to citation occurrence 4.0 Back to citation occurrence 4.1 John Paul II, Veritatis Splendor — Encyclical on the moral law, the natural law, virtue, and the relation of human freedom to eternal and divine law without reducing morality to mere consensus.
- Back to citation Catholic Encyclopedia (1913), Intellect — Public-domain scholastic survey of intellect as a spiritual cognitive power, including the Aristotelian-Thomistic distinction of agent and possible intellect.
- Back to citation occurrence 6.0 Back to citation occurrence 6.1 Catechism of the Catholic Church, 1803–1845 — Authoritative synthesis of human and theological virtues, their acquisition or infusion, the cardinal structure, and charity as the form of the virtues.