If, however, we take it in a more general sense, as comprising any kind of human knowledge, then prudence, as regards a certain part thereof, belongs to the contemplative life. In this sense Tully (De Offic. i, 5) says that "the man who is able most clearly and quickly to grasp the truth and to unfold his reasons, is wont to be considered most prudent and wise."
Reply Obj. 1: Moral works take their species from their end, as stated above (I-II, Q. 18, AA. 4, 6), wherefore the knowledge pertaining to the contemplative life is that which has its end in the very knowledge of truth; whereas the knowledge of prudence, through having its end in an act of the appetitive power, belongs to the active life.
Reply Obj. 2: External occupation makes a man see less in intelligible things, which are separated from sensible objects with which the works of the active life are concerned. Nevertheless the external occupation of the active life enables a man to see more clearly in judging of what is to be done, which belongs to prudence, both on account of experience, and on account of the mind's attention, since "brains avail when the mind is attentive" as Sallust observes [*Bell. Catilin., LI].
Reply Obj. 3: Prudence is said to be intermediate between the intellectual and the moral virtues because it resides in the same subject as the intellectual virtues, and has absolutely the same matter as the moral virtues. But this third kind of life is intermediate between the active and the contemplative life as regards the things about which it is occupied, because it is occupied sometimes with the contemplation of the truth, sometimes with eternal things. _______________________
THIRD ARTICLE [II-II, Q. 811, Art. 3]
Whether Teaching Is a Work of the Active or of the Contemplative Life?
Objection 1: It would seem that teaching is a work not of the active but of the contemplative life. For Gregory says (Hom. v in Ezech.) that "the perfect who have been able to contemplate heavenly goods, at least through a glass, proclaim them to their brethren, whose minds they inflame with love for their hidden beauty." But this pertains to teaching. Therefore teaching is a work of the contemplative life.
Obj. 2: Further, act and habit would seem to be referable to the same kind of life. Now teaching is an act of wisdom: for the Philosopher says (Metaph. i, 1) that "to be able to teach is an indication of knowledge." Therefore since wisdom or knowledge pertain to the contemplative life, it would seem that teaching also belongs to the contemplative life.
Obj. 3: Further, prayer, no less than contemplation, is an act of the contemplative life. Now prayer, even when one prays for another, belongs to the contemplative life. Therefore it would seem that it belongs also to the contemplative life to acquaint another, by teaching him, of the truth we have meditated.
On the contrary, Gregory says (Hom. xiv in Ezech.): "The active life is to give bread to the hungry, to teach the ignorant the words of wisdom."