Letters 101.8

The greatest flaw in life is that it is always imperfect, and that a certain part of it is postponed. One who daily puts the finishing touches to his life is never in want of time. And yet, from this want arise fear and a craving for the future which eats away the mind. There is nothing more wretched than worry over the outcome of future events; as to the amount or the nature of that which remains, our troubled minds are set a-flutter with unaccountable fear.

Seneca, Letters to Lucilius 101.8, translated by Richard Mott Gummere