Psalm 39:5 (NIV) You have made my days a mere handbreadth; the span of my years is as nothing before you. Each man's life is but a breath. Selah
James 4:14 (NIV) Why, you do not even know what will happen tomorrow. What is your life? You are a mist that appears for a little while and then vanishes.
We are always complaining that our days are few and acting as though there would be no end of them. —Seneca
Elesha Hodge, comp., Today's Best Illustrations – Volumes 1-4, (Carol Stream, IL: Christianity Today, 1997), WORDsearch CROSS e-book, Under: "PHYSICAL LIFE".