text: Let us therefore strive with all courage, omitting attractions by the way; let us struggle with a single purpose, lest, when we are left behind, we comprehend too late the speed of quick-flying time, whose course we cannot stay. Let every day, as soon as it comes, be welcome as being the choicest, and let it be made our own possession. We must catch that which flees. Now he who scans with a scholar's eye the lines I have just quoted, does not reflect that our first days are the best because disease is approaching and old age weighs upon us and hangs over our heads while we are still thinking about our youth. He thinks rather of Vergil's usual collocation of disease and eld; and indeed rightly. For old age is a disease which we cannot cure. "Besides," he says to himself, "think of the epithet that accompanies eld; Vergil calls it bitter," –