On the Shortness of Life

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!

Seneca, On the Shortness of Life 3.3 (tr. John W. Basore)