As a young man or woman, you must constantly fight off the temptation to forget about the brevity of life and the vanity of even the longest life lived apart from God’s will. You must learn from the Scriptures that your life is less than a vapor. You must become convinced of this truth, and then you must set it before you as a constant reminder. You are mortal and your days are numbered! (See Psalm 39:4; 90:12; 103:15; James 4:14).
Keeping your mortality at the forefront of your thoughts is not for the purpose of being morbid or lamenting as those who have no hope, but to compel you to hope in Christ alone and to give yourself wholeheartedly to His will for your life. Only in Christ is the grave swallowed up in victory and temporal futility replaced by God’s eternal and glorious purpose for you.Paul Washer, A Word To the Young