It is difficult to retain what you may have learned unless you should practice it. -Difficile est tenere quae acceperis nisi exerceas
Pliny the YoungerFor however often a man may receive an obligation from you, if you refuse a request, all former favors are effaced by this one denial.
Pliny the YoungerGenerosity, when once set going, knows not how to stop; as the more familiar we are with the lovely form, the more enamored we become of her charms.
Pliny the Younger