Remember that overwhelmingly sad feeling when you learned that someone you loved died? remember the guilt and embarrassment you felt after your biggest failure was exposed? remember facing the biggest problem in your life and thinking that it was impossible to fix? remember that time, as a little kid, when someone held you under the swimming pool too long, and you thought you were going to drown? roll all of those emotions into one, carry them around with you every day from the time you wake up until the time you fall asleep, and you will begin to understand the dragon of depression.