You can become a channel of profit for many

Venerable John Climacus ~ The Ladder of Divine Ascent
Step 12 ~ On Lying

¶5. When the demons see that, after the mischievous relater of jests has begun, we attempt to flee from hearing him, as it were from an infectious disease, then they try to catch us by two thoughts, suggesting to us: ‘Do not offend the story-teller,’ or: ‘Do not appear to love God more than they do.’ Be off! Do not dally, otherwise at the time of your prayer, the jokes will recur to your mind. And not only run, but even piously disconcert the bad company by offering for their general attention the thought of death and judgment. For perhaps it is better for you to be sprinkled with a few drops of vainglory, if only you can become a channel of profit for many.

Remember thy last, and thou shalt never sin unto eternity

Venerable John Climacus ~ The Ladder of Divine Ascent
Step 6 ~ On Remembrance of Death

¶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 Greeks 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, and thou shalt never sin unto eternity.

Remembrance of death

Venerable Isaac of Syria

Why do you trouble yourself in a house that is not your own? Let the sight of a dead man be a teacher for you concerning your departure from hence.

Knowledge of the hour of death

Venerable John Climacus ~ The Ladder of Divine Ascent
Step 6 ~ On Remembrance of Death

¶9. Some inquire and wonder: 'Why, when the remembrance of death is so beneficial for us, has God hidden from us the knowledge of the hour of death?' - not knowing that in this way God wonderfully accomplishes our salvation. For no one who foreknew his death would at once proceed to baptism or the monastic life; but everyone would spend all his days in iniquities, and only on the day of his death would he approach baptism and repentance. From long habit, he would become confirmed in vice, and would remain utterly incorrigible.