From Maria Popova's BRAIN PICKINGS, we have the following, which bears some consderation for many of us:

“How we spend our days is, of course, how we spend our lives,” Annie Dillard wrote in her abiding insistence on choosing presence over productivity. But how do we really spend our days? In our era, the average human lifetime will contain two years of boredom, six months of watching commercials, 67 days of heartbreak, and 14 minutes of pure joy.

This devastating arithmetic of time wasted versus time meaningfully spent may seem like a modern problem, but while the nature of our cultural technologies has undeniably exacerbated the ratio, the equation itself stretches all the way to antiquity, with only the variables altered. (Lest we forget, books were derided as a dangerous distraction in 12th-century Japan.)

That equation, and how to balance it more favorably toward a life of substance and presence rather than one of waste and want, is what the great first-century Roman philosopher Seneca examined at the end of his life in Letters from a Stoic (public library) — a collection of 124 letters he composed to his friend Lucilius, which also gave us Seneca on true and false friendship, overcoming fear, and the antidote to anxiety.

Seneca

Fittingly, the first letter addresses the most urgent subject haunting human life: time, and more particularly, the existential calculus of how we spend or waste the sliver of time allotted us along the continuum of being. Fifteen years after he composed his timeless treatise on filling the shortness of life with wide living, Seneca, now in his final years, counsels his friend:

Set yourself free for your own sake; gather and save your time, which till lately has been forced from you, or filched away, or has merely slipped from your hands… Certain moments are torn from us… some are gently removed… others glide beyond our reach. The most disgraceful kind of loss, however, is that due to carelessness.

The most perilous carelessness, Seneca argues eighteen centuries before Kierkegaard bemoaned the absurdity of busyness and Walt Whitman contemplated what makes life worth living, is that of sliding through life in a trance of expectancy, always vacating the present moment in order to lurch toward the next — a kind of living death. He writes:
What man can you show me who places any value on his time, who reckons the worth of each day, who understands that he is dying daily? For we are mistaken when we look forward to death; the major portion of death has already passed. Whatever years lie behind us are in death’s hands.

Therefore… hold every hour in your grasp. Lay hold of to-day’s task, and you will not need to depend so much upon to-morrow’s. While we are postponing, life speeds by. Nothing… is ours, except time. We were entrusted by nature with the ownership of this single thing, so fleeting and slippery that anyone who will can oust us from possession. What fools these mortals be! They allow the cheapest and most useless things, which can easily be replaced, to be charged in the reckoning, after they have acquired them; but they never regard themselves as in debt when they have received some of that precious commodity, — time! And yet time is the one loan which even a grateful recipient cannot repay.

Reflecting on how he himself practices what he is preaching, Seneca writes with Stoic self-awareness:

I confess frankly: my expense account balances, as you would expect from one who is free-handed but careful. I cannot boast that I waste nothing, but I can at least tell you what I am wasting, and the cause and manner of the loss; I can give you the reasons why I am a poor man… I do not regard a man as poor, if the little which remains is enough for him. I advise you, however, to keep what is really yours; and you cannot begin too early. For, as our ancestors believed, it is too late to spare when you reach the dregs of the cask. Of that which remains at the bottom, the amount is slight, and the quality is vile.

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Art by Lisbeth Zwerger for a special edition of Alice’s Adventures in Wonderland