WHY DOES THE DEVIL EXIST?

Sometimes i wonder why the devil exists.
Why is there someone who wants to, at every moment pop into your brain and make you feel worthless, like your insecurities are overpowering what really matters.
Whenever something bad happens, the devil finds it a perfect opportunity to push us when we are already down, make us fall deeper and deeper into the pit of despair. BUT when everything seems so dark, there is always a glimmer of light shinning through the only crack, You start playing with the crack with your finger until it starts to get bigger. As time goes by you notice that the hole is big enough to get your body through; but you cant reach it, you jump and jump until you are out of strength, you sit down and sink into the corner. Eventually you see a hand reaching down through the crack, you reach out to grab it, but realize that there is nothing there. suddenly you feel like your sitting on a cloud, like your walking on air. you feel invincible. you start to float up, you have this weird, yet comfortable tingling feeling inside, you close your eyes, and suddenly
YOUR ON TOP OF THE WORLD!