"Ironically the pragmatic meaning of prudence is exactly the opposite of its traditional meaning. Traditionally prudence was not considered contrary to virtue; it was the highest virtue: It meant the wisdom to practice all the virtues in the right time and circumstance."
Middle Ages Quotes on Prudence
"Now it happens that the intellect is moved by the will, just as are the other powers: for a man considers something actually, because he wills to do so. And therefore the intellect, in so far as it is subordinate to the will, can be the subject of virtue absolutely so called. And in this way the speculative intellect, or the reason, is the subject of Faith: for the intellect is moved by the command of the will to assent to what is of faith: for 'no man believeth, unless he will' [*Augustine: Tract. xxvi in Joan.]. But the practical intellect is the subject of prudence. For since prudence is the right reason of things to be done, it is a condition thereof that man be rightly disposed in regard to the principles of this reason of things to be done, that is in regard to their ends, to which man is rightly disposed by the rectitude of the will, just as to the principles of speculative truth he is rightly disposed by the natural light of the active intellect. And therefore as the subject of science, which is the right reason of speculative truths, is the speculative intellect in its relation to the active intellect, so the subject of prudence is the practical intellect in its relation to the right will."
"This is great wisdom, not to be hasty in action, or stubborn in our own opinions. A part of this wisdom also is not to believe every word we hear, nor to tell others all that we hear, even though we believe it. Take counsel with a man who is wise and of a good conscience; and seek to be instructed by one better than thyself, rather than to follow thine own inventions."