John 16:33   These things I have spoken unto you, that in me ye might have peace. In the world ye shall have tribulation: but be of good cheer; I have overcome the world.

Constant Negative Thinking
“having a thought makes it easier for you to have that thought again. That’s not good news for the perpetually gloomy. [Although happily, it seems gratitude, can work the opposite way, building up your positivity muscles]. It gets worse, too. Not only do repeated negative thoughts make it easier to think yet more negative thoughts, they also make it more likely that negative thoughts will occur to you just randomly walking down the street.. [Another way to put this is that being consistently negative starts to push your personality towards the negative].”

“Doubt not any of these truths even after you are scattered abroad by persecution and are downcast by many sorrows. When you feel that you are alone in the world, I will know of your isolation even as, when you are scattered every man to his own place, leaving the Son of Man in the hands of his enemies, you will know of mine. But I am never alone; always is the Father with me. Even at such a time I will pray for you. And all of these things have I told you that you might have peace and have it more abundantly. In this world you will have tribulation, but BE OF GOOD CHEER; I have triumphed in the world and shown you the way to eternal joy and everlasting service.