On the Shortness of Life: Stoics in Their Own Words, Book 4 (Unabridged‪)‬

Why do we complain of Nature? She has shown herself kindly; life, if you know how to use it, is long. But one man is possessed by an avarice that is insatiable, another by a toilsome devotion to tasks that are useless; one man is besotted with wine, another is paralyzed by sloth; one man is exhausted by an ambition that always hangs upon the decision of others, another, driven on by the greed of the trader, is led over all lands and all seas by the hope of gain; some are tormented by a passion for war and are always either bent upon inflicting danger upon others or concerned about their own; some there are who are worn out by voluntary servitude in a thankless attendance upon the great; many are kept busy either in the pursuit of other men's fortune or in complaining of their own; many, following no fixed aim, shifting and inconstant and dissatisfied, are plunged by their fickleness into plans that are ever new; some have no fixed principle by which to direct their course, but Fate takes them unawares while they loll and yawn - so surely does it happen that I cannot doubt the truth of that utterance which the greatest of poets delivered with all the seeming of an oracle: The part of life we really live is small. For all the rest of existence is not life, but merely time.