Refuse to listen to the devil when he whispers to you: give me now, and you will give tomorrow to God. No, no! Spend all the hours of your life in a way pleasing to God; keep in your mind the thought that after the present hour you will not be given another and that you will have to render a strict account for every minute of this present hour.

+ St. Theophan the Recluse (Unseen Warfare)