“Young people need authentic teachers: persons open to the fullness of truth in the various branches of knowledge, persons who listen to and experience in own hearts that interdisciplinary dialogue; persons who, above all, are convinced of our human capacity to advance along the path of truth. Youth is a privileged time for seeking and encountering truth. As Plato said: “Seek truth while you are young, for if you do not, it will later escape your grasp” (Parmenides, 135d). This lofty aspiration is the most precious gift which you can give to your students, personally and by example. It is more important than mere technical know-how, or cold and purely functional data.

“I urge you, then, never to lose that sense of enthusiasm and concern for truth. Always remember that teaching is not just about communicating content, but about forming young people. You need to understand and love them, to awaken their innate thirst for truth and their yearning for transcendence. Be for them a source of encouragement and strength.

“We must not draw students to ourselves, but set them on the path toward the truth, which we seek together. The Lord will help you in this, for he asks you to be plain and effective like salt, or like the lamp which quietly lights the room (cf. Mt 5:13).”

— Pope Benedict XVI, addressing a gathering of young university professors, in Madrid.  19 August 2011.

Whole text here: http://www.zenit.org/article-33232?l=english