The Ladder of Divine Ascent – Step 6, The Last Two Paragraphs

23. Do not deceive yourself, rash worker, as if one time can make up for another. For the day is not sufficient to repay in full its own debt to the Lord.

24. It is impossible, someone says, impossible to spend the present day devoutly unless we regard it as the last of our whole life. And it is truly astonishing how even the pagans have said something of the sort, since they define philosophy as meditation on death.

This is the sixth step. He who has mounted it will never sin again. Remember thy last end, and thoushalt never sin.