Section 16: The Busy Lose Past, Present, And Future explained simply

XVI. Those men lead the shortest and unhappiest lives who forget the past, neglect the present, and dread the future: when they reach the end of it the poor wretches learn too late that they were busied all the while that they were doing nothing. You need not think, because sometimes they call for death, that their lives are long: their folly torments them with vague passions which lead them into the very things of which they are afraid: they often, therefore, wish for death because they live in fear. Neither is it, as you might think, a proof of the length of their lives that they often find the days long, that they often complain how slowly the hours pass until the appointed time arrives for dinner: for whenever they are left without their usual business, they fret helplessly in their idleness, and know not how to arrange or to spin it out. They betake themselves, therefore, to some business, and all the intervening time is irksome to them; they would wish, by Hercules, to skip over it, just as they wish to skip over the intervening days before a gladiatorial contest or some other time appointed for a public spectacle or private indulgence: all postponement of what they wish for is grievous to them. Yet the very time which they enjoy is brief and soon past, and is made much briefer by their own fault: for they run from one pleasure to another, and are not able to devote themselves consistently to one passion: their days are not long, but odious to them: on the other hand, how short they find the nights which they spend with courtezans or over wine? Hence arises that folly of the poets who encourage the errors of mankind by their myths, and declare that Jupiter to gratify his voluptuous desires doubled the length of the night. Is it not adding fuel to our vices to name the gods as their authors, and to offer our distempers free scope by giving them deity for an example? How can the nights for which men pay so dear fail to appear of the shortest? they lose the day in looking forward to the night, and lose the night through fear of the dawn.