But as concerning these days which we are passing now, the Apostle says, “Redeeming the time, because the days are evil.” Are not these days indeed evil which we spend in this corruptible flesh, in or under so heavy a load of the corruptible body, amid so great temptations, amid so great difficulties, where there is but false pleasure, no security of joy, a tormenting fear, a greedy covetousness, a withering sadness?
Lo, what evil days! yet no one is willing to end these same evil days, and hence men earnestly pray God that they may live long. Yet what is it to live long, but to be long tormented? What is it to live long, but to add evil days to evil days? When boys are growing up, it is as if days are being added to them; whereas they do not know that they are being diminished; and their very reckoning is false. For as we grow up, the number of our days rather diminishes than increases. Appoint for any man at his birth, for instance, eighty years; every day he lives, he diminishes somewhat of that sum. Yet silly men rejoice at the oft-recurring birthdays, both of themselves and their children. O sensible man! If the wine in thy bottle is diminished, thou art sad; days art thou losing, and art thou glad?
These days then are evil; and so much the more evil, in that they are loved. This world is so alluring, that no one is willing to finish a life of sorrow. For the true, the blessed life is this, when we shall rise again, and reign with Christ. For the ungodly too shall rise again, but to go into the fire. Life then is there none but that which is blessed. And blessed life there can be none but that which is eternal, where are “good days;” and those not many days, but one day. They are called “days” after the custom of this life. That day knows no rising, it knows no setting. To that day there succeeds no tomorrow; because no yesterday precedes it. This day, or these days, and this life, this true life, have we in promise. It is then the reward of a certain work. So if we love the reward, let us not fail in the work; and so shall we reign with Christ forever.
Augustine of Hippo, Saint Augustin: Sermon on the Mount, Harmony of the Gospels, Homilies on the Gospels, 1888, 6, 366.