Prudence - Article 14

Article 14. Whether prudence is in all who have grace?

No man has grace unless he be virtuous. Now no man can be virtuous without prudence, for Gregory says (Moral. ii, 46) that "the other virtues cannot be virtues at all unless they effect prudently what they desire to accomplish." Therefore all who have grace have prudence.

I answer that, The virtues must needs be connected together, so that whoever has one has all, as stated above (I-II, 65, 1). Now whoever has grace has charity, so that he must needs have all the other virtues, and hence, since prudence is a virtue, as shown above (Article 4), he must, of necessity, have prudence also.

http://www.newadvent.org/summa/3047.htm#article14