death will be at hand, for which, willy nilly, you must find leisure.

"So it is—the life we receive is not short, but we make it so, nor do we have any lack of it, but are wasteful of it.

...

Look back in memory and consider when you ever had a fixed plan, how few days have passed as you had intended, when you were ever at your own disposal, when your face ever wore its natural expression, when your mind was ever unperturbed, what work you have achieved in so long a life, how many have robbed you of life when you were not aware of what you were losing, how much was taken up in useless sorrow, in foolish joy, in greedy desire, in the allurements of society, how little of yourself was left to you; you will perceive that you are dying before your season! What, then, is the reason of this?

...

Believe me, it takes a great man and one who has risen far above human weaknesses not to allow any of his time to be filched from him, and it follows that the life of such a man is very long because he has devoted wholly to himself whatever time he has had. None of it lay neglected and idle; none of it was under the control of another, for, guarding it most grudgingly, he found nothing that was worthy to be taken in exchange for his time. And so that man had time enough, but those who have been robbed of much of their life by the public, have necessarily had too little of it.

...

Everyone hurries his life on and suffers from a yearning for the future and a weariness of the present. But he who bestows all of his time on his own needs, who plans out every day as if it were his last, neither longs for nor fears the morrow. For what new pleasure is there that any hour can now bring? They are all known, all have been enjoyed to the full. Mistress Fortune may deal out the rest as she likes; his life has already found safety. Something may be added to it, but nothing taken from it, and he will take any addition as the man who is satisfied and filled takes the food which he does not desire and yet can hold. And so there is no reason for you to think that any man has lived long because he has grey hairs or wrinkles; he has not lived long—he has existed long. For what if you should think that that man had had a long voyage who had been caught by a fierce storm as soon as he left harbour, and, swept hither and thither by a succession of winds that raged from different quarters, had been driven in a circle around the same course? Not much voyaging did he have, but much tossing about.

...

Life will follow the path it started upon, and will neither reverse nor check its course; it will make no noise, it will not remind you of its swiftness. Silent it will glide on; it will not prolong itself at the command of a king, or at the applause of the populace. Just as it was started on its first day, so it will run; nowhere will it turn aside, nowhere will it delay. And what will be the result? You have been engrossed, life hastens by; meanwhile death will be at hand, for which, willy nilly, you must find leisure."

-- On The Shortness of Life, Lucius Seneca