On the contrary, The Philosopher says (Ethic. vi, 10) that "prudence commands."
I answer that, Prudence is "right reason applied to action," as stated above (A. 2). Hence that which is the chief act of reason in regard to action must needs be the chief act of prudence. Now there are three such acts. The first is to take counsel, which belongs to discovery, for counsel is an act of inquiry, as stated above (I-II, Q. 14, A. 1). The second act is to judge of what one has discovered, and this is an act of the speculative reason. But the practical reason, which is directed to action, goes further, and its third act is to command, which act consists in applying to action the things counselled and judged. And since this act approaches nearer to the end of the practical reason, it follows that it is the chief act of the practical reason, and consequently of prudence.
In confirmation of this we find that the perfection of art consists in judging and not in commanding: wherefore he who sins voluntarily against his craft is reputed a better craftsman than he who does so involuntarily, because the former seems to do so from right judgment, and the latter from a defective judgment. On the other hand it is the reverse in prudence, as stated in Ethic. vi, 5, for it is more imprudent to sin voluntarily, since this is to be lacking in the chief act of prudence, viz. command, than to sin involuntarily.
Reply Obj. 1: The act of command extends both to the ensuing of good and to the avoidance of evil. Nevertheless Augustine ascribes "the avoidance of ambushes" to prudence, not as its chief act, but as an act of prudence that does not continue in heaven.
Reply Obj. 2: Good counsel is required in order that the good things discovered may be applied to action: wherefore command belongs to prudence which takes good counsel.
Reply Obj. 3: Simply to move belongs to the will: but command denotes motion together with a kind of ordering, wherefore it is an act of the reason, as stated above (I-II, Q. 17, A. 1). _______________________
NINTH ARTICLE [II-II, Q. 47, Art. 9]
Whether Solicitude Belongs to Prudence?
Objection 1: It would seem that solicitude does not belong to prudence. For solicitude implies disquiet, wherefore Isidore says (Etym. x) that "a solicitous man is a restless man." Now motion belongs chiefly to the appetitive power: wherefore solicitude does also. But prudence is not in the appetitive power, but in the reason, as stated above (A. 1). Therefore solicitude does not belong to prudence.
Obj. 2: Further, the certainty of truth seems opposed to solicitude, wherefore it is related (1 Kings 9:20) that Samuel said to Saul: "As for the asses which were lost three days ago, be not solicitous, because they are found." Now the certainty of truth belongs to prudence, since it is an intellectual virtue. Therefore solicitude is in opposition to prudence rather than belonging to it.