Excerpt from The Life of St. Antony:

'Wherefore, children, let us hold fast our discipline, and let us not be careless. For in it the Lord is our fellow-worker, as it is written, "to all that choose the good, God worketh with them for good." But to avoid being heedless, it is good to consider the word of the Apostle, "I die daily.'' For if we too live as though dying daily, we shall not sin. And the meaning of that saying is, that as we rise day by day we should think that we shall not abide till evening; and again, when about to lie down to sleep, we should think that we shall not rise up. For our life is naturally uncertain, and Providence allots it to us daily. But thus ordering our daily life, we shall neither fall into sin, nor have a lust for anything, nor cherish wrath against any, nor shall we heap up treasure upon earth. But, as though under the daily expectation of death, we shall be without wealth, and shall forgive all things to all men, nor shall we retain at all the desire of women or of any other foul pleasure. But we shall turn from it as past and gone, ever striving and looking forward to the day of Judgment. For the greater dread and danger of torment ever destroys the ease of pleasure, and sets up the soul if it is like to fall.