Fr. John A. Hardon on Prudence

Correct knowledge about things to be done or, more broadly, the knowledge of things that ought to be done and of things that ought to be avoided. It is the intellectual virtue whereby a human being recognizes in any matter at hand what is good and what is evil. In this sense, it is the moral virtue that enables a person to devise, choose, and prepare suitable means for the attainment of any purpose or the avoidance of any evil. Prudence resides in the practical intellect and is both acquired by one's own acts and infused at the same time as sanctifying grace. It may be said to be natural as developed by us, and supernatural because conferred by God. As an act of virtue, prudence involves three stages of mental operation: to take counsel carefully with oneself and from others; to judge correctly on the basis of the evidence at hand; and to direct the rest of one's activity according to the norms determined after a prudent judgment has been made. (Etym. Latin prudentia, foresight in the practical order; from providentia, foresight, directive care, providence.)

 

Modern Catholic Dictionary by Fr. John A. Hardon, S.J.
http://www.therealpresence.org/cgi-bin/getdefinition.pl