The only certain thing in life is that we are going to die - and yet we live our lives as if this would never happen. Worse - we live our lives without having fully lived. When death comes to you, what will there won't be an extra minute to finishing up the unfinished life; there won't be an extra day to do the things you left for later. Nothing can be worse than meeting death without having truly lived.
(thought about that after watching a novela where this young lady finds out she only has 6 months to live. Made me think of my life, and what if that happened to me? What would I have to claim as my life really?)