One English translation of that is"O Sapientia, quae ex ore Altissimi prodidisti, attingens a fine usque ad finem, fortiter suaviter disponensque omnia: veni ad docendum nos viam prudentiae. "*
So today in our preparations for Christmas we pray to develop the virtue of prudence. But what exactly is prudence, what does the Church mean by this prayer. Prudence is defined in paragraph 1806 of the Catechism of the Catholic Church as"O Wisdom, who came from the mouth of the Most High, reaching from end to end and ordering all things mightily and sweetly: come, and teach us the way of prudence."*
"Prudence is the virtue that disposes practical reason to discern our true good in every circumstance and to choose the right means of achieving it; "the prudent man looks where he is going." "Keep sane and sober for your prayers." Prudence is "right reason in action," writes St. Thomas Aquinas, following Aristotle. It is not to be confused with timidity or fear, nor with duplicity or dissimulation. It is called auriga virtutum (the charioteer of the virtues); it guides the other virtues by setting rule and measure. It is prudence that immediately guides the judgment of conscience. The prudent man determines and directs his conduct in accordance with this judgment. With the help of this virtue we apply moral principles to particular cases without error and overcome doubts about the good to achieve and the evil to avoid."So according to the Catechism of the Catholic Church prudence is the ability not only to see right from wrong, to see clearly the difference between good and evil choices, in specific situations but to also make the choices in those situations that are pleasing to God.
*Original Latin and English translation from http://www.wdtprs.com/JTZ/o_antiphons/