The First Book of Logical Exercises by Andreas Libavius

Contumacy of learners.

even when they know nothing, nor have any hope of fruitful success, they do not wish to obey those who advise them and instill countless advantages. They hasten to leave because the base desire of the mind persuades them; because the first down begins to clothe their chin, and when that appears, they think it a crime to apply themselves to the masters in a trivial game. But many of us know that these are foolish, and we see them being dragged to misfortune.

A beard ought not to obstruct discipline.

For what should a beard impede, such that I cannot learn many things wherever I am? If it is troublesome, the razors of barbers are a remedy. The desire of the mind proves that they have not yet learned that well-known doctrine of Plato concerning the multi-headed beast referring to the beast of the soul that must be tamed by reason which must be tamed by reason. But most of us will not be moved by the example of these men. We will give ourselves to you for long enough, nor will we leave your school before you yourself have judged that we are ready for richer commerce metaphor for advanced study; since your judgment carries the greatest weight among us, as we know what kind of evaluator of talents you are.

OR. I love you, Philomathes, for your very spirit. Continue to be generous, and if you know any who are hesitant, studiously draw them into your opinion; which you will do far more easily than a teacher, since likes learn more promptly from their likes.