Thomas Aquinas - Summa Theologica, Part I-II (Pars Prima Secundae)

Obj. 3: Further, happiness is a good of man himself. But the speculative intellect is more concerned with things outside man; whereas the practical intellect is concerned with things belonging to man himself, viz. his operations and passions. Therefore man's happiness consists in an operation of the practical intellect rather than of the speculative.

On the contrary, Augustine says (De Trin. i, 8) that "contemplation is promised us, as being the goal of all our actions, and the everlasting perfection of our joys."

I answer that, Happiness consists in an operation of the speculative rather than of the practical intellect. This is evident for three reasons. First because if man's happiness is an operation, it must needs be man's highest operation. Now man's highest operation is that of his highest power in respect of its highest object: and his highest power is the intellect, whose highest object is the Divine Good, which is the object, not of the practical but of the speculative intellect. Consequently happiness consists principally in such an operation, viz. in the contemplation of Divine things. And since that "seems to be each man's self, which is best in him," according to Ethic. ix, 8, and x, 7, therefore such an operation is most proper to man and most delightful to him.

Secondly, it is evident from the fact that contemplation is sought principally for its own sake. But the act of the practical intellect is not sought for its own sake but for the sake of action: and these very actions are ordained to some end. Consequently it is evident that the last end cannot consist in the active life, which pertains to the practical intellect.

Thirdly, it is again evident, from the fact that in the contemplative life man has something in common with things above him, viz. with God and the angels, to whom he is made like by happiness. But in things pertaining to the active life, other animals also have something in common with man, although imperfectly.

Therefore the last and perfect happiness, which we await in the life to come, consists entirely in contemplation. But imperfect happiness, such as can be had here, consists first and principally, in an operation of the practical intellect directing human actions and passions, as stated in Ethic. x, 7, 8.

Reply Obj. 1: The asserted likeness of the practical intellect to God is one of proportion; that is to say, by reason of its standing in relation to what it knows, as God does to what He knows. But the likeness of the speculative intellect to God is one of union and "information"; which is a much greater likeness. And yet it may be answered that, in regard to the principal thing known, which is His Essence, God has not practical but merely speculative knowledge.

Reply Obj. 2: The practical intellect is ordained to good which is outside of it: but the speculative intellect has good within it, viz. the contemplation of truth. And if this good be perfect, the whole man is perfected and made good thereby: such a good the practical intellect has not; but it directs man thereto.

Reply Obj. 3: This argument would hold, if man himself were his own last end; for then the consideration and direction of his actions and passions would be his happiness. But since man's last end is something outside of him, to wit, God, to Whom we reach out by an operation of the speculative intellect; therefore, man's happiness consists in an operation of the speculative intellect rather than of the practical intellect. ________________________

SIXTH ARTICLE [I-II, Q. 3, Art. 6]

Whether Happiness Consists in the Consideration of Speculative Sciences?

Objection 1: It would seem that man's happiness consists in the consideration of speculative sciences. For the Philosopher says (Ethic. i, 13) that "happiness is an operation according to perfect virtue." And in distinguishing the virtues, he gives no more than three speculative virtues—"knowledge," "wisdom" and "understanding," which all belong to the consideration of speculative sciences. Therefore man's final happiness consists in the consideration of speculative sciences.

Obj. 2: Further, that which all desire for its own sake, seems to be man's final happiness. Now such is the consideration of speculative sciences; because, as stated in Metaph. i, 1, "all men naturally desire to know"; and, a little farther on (2), it is stated that speculative sciences are sought for their own sakes. Therefore happiness consists in the consideration of speculative sciences.

Obj. 3: Further, happiness is man's final perfection. Now everything is perfected, according as it is reduced from potentiality to act. But the human intellect is reduced to act by the consideration of speculative sciences. Therefore it seems that in the consideration of these sciences, man's final happiness consists.

On the contrary, It is written (Jer. 9:23): "Let not the wise man glory in his wisdom": and this is said in reference to speculative sciences. Therefore man's final happiness does not consist in the consideration of these.

I answer that, As stated above (A. 2, ad 4), man's happiness is twofold, one perfect, the other imperfect. And by perfect happiness we are to understand that which attains to the true notion of happiness; and by imperfect happiness that which does not attain thereto, but partakes of some particular likeness of happiness. Thus perfect prudence is in man, with whom is the idea of things to be done; while imperfect prudence is in certain irrational animals, who are possessed of certain particular instincts in respect of works similar to works of prudence.

Accordingly perfect happiness cannot consist essentially in the consideration of speculative sciences. To prove this, we must observe that the consideration of a speculative science does not extend beyond the scope of the principles of that science: since the entire science is virtually contained in its principles. Now the first principles of speculative sciences are received through the senses, as the Philosopher clearly states at the beginning of the Metaphysics (i, 1), and at the end of the Posterior Analytics (ii, 15). Wherefore the entire consideration of speculative sciences cannot extend farther than knowledge of sensibles can lead. Now man's final happiness, which is his final perfection cannot consist in the knowledge of sensibles. For a thing is not perfected by something lower, except in so far as the lower partakes of something higher. Now it is evident that the form of a stone or of any sensible, is lower than man. Consequently the intellect is not perfected by the form of a stone, as such, but inasmuch as it partakes of a certain likeness to that which is above the human intellect, viz. the intelligible light, or something of the kind. Now whatever is by something else is reduced to that which is of itself. Therefore man's final perfection must needs be through knowledge of something above the human intellect. But it has been shown (I, Q. 88, A. 2), that man cannot acquire through sensibles, the knowledge of separate substances, which are above the human intellect. Consequently it follows that man's happiness cannot consist in the consideration of speculative sciences. However, just as in sensible forms there is a participation of the higher substances, so the consideration of speculative sciences is a certain participation of true and perfect happiness.

Reply Obj. 1: In his book on Ethics the Philosopher treats of imperfect happiness, such as can be had in this life, as stated above (A. 2, ad 4).

Reply Obj. 2: Not only is perfect happiness naturally desired, but also any likeness or participation thereof.

Reply Obj. 3: Our intellect is reduced to act, in a fashion, by the consideration of speculative sciences, but not to its final and perfect act. ________________________