[212] And it is laid down as a doctrine of the most general applicability and usefulness, that every author of pleasure is unproductive of wisdom, being neither male nor female, because it is incompetent either to give or to receive the seeds which have a tendency to incorruptibility, but is able only to study the most disgraceful habits of life, to destroy what ought to be indestructible, and to extinguish the torches of wisdom, which ought to be enduring and inextinguishable.