Hope is a necessity

Years ago, I have always had this vision: When I close my eyes, in its total darkness, I can always see a little light at the far horizon. It is always very comforting to know that there's a light at the end of a tunnel. For a while I have gone through life not having that luxury of "seeing light at the end of the tunnel". Life's turmoil, worries and anxieties have piled up so much that I no longer can see that vision. Is it a necessity in life to have that hope? Or is it merely some luxury that is only enjoy by some? I realize I am not getting anywhere in that state. I need to focus to gain back that vision. Perhaps this is how I keep on having faith and hope.