Among the Greeks and Romans this need is everywhere visible, not only in their comedy and their literature generally, but in everyday life. As Nietzsche truly remarks (in his _Geburt der Tragödie_) the Greeks recognized all natural impulses, even those that are seemingly unworthy, and safeguarded them from working mischief by providing channels into which, on special days and in special rites, the surplus of wild energy might harmlessly flow. Plutarch, the last and most influential of the Greek moralists, well says, when advocating festivals (in his essay "On the Training of Children"), that "even in bows and harps we loosen their strings that we may bend and wind them up again." Seneca, perhaps the most influential of Roman if not of European moralists, even recommended occasional drunkenness. "Sometimes," he wrote in his _De Tranquillilate_, "we ought to come even to the point of intoxication, not for the purpose of drowning ourselves but of sinking ourselves deep in wine. For it washes away cares and raises our spirits from the lowest depths. The inventor of wine is called _Liber_ because he frees the soul from the servitude of care, releases it from slavery, quickens it, and makes it bolder for all undertakings." The Romans were a sterner and more serious people than the Greeks, but on that very account they recognized the necessity of occasionally relaxing their moral fibres in order to preserve their tone, and encouraged the prevalence of festivals which were marked by much more abandonment than those of Greece. When these festivals began to lose their moral sanction and to fall into decay the decadence of Rome had begun.