Essentially the Secret but the Bible version?
*Vomits*

Also, what Scribz said is pretty accurate.
Depression isn't ever a choice, no one goes "I want to be depressed". But certain actions (or lack of actions) taken can throw someone into a situation where they become depressed and hurt, or prevent themselves from fighting through their current depression. 

I think even people without Depression can relate to that at least, ever been in a case where a depressed friend constantly brings your mood down? But you choose to stick around cause you want to help them feel better? Or ever been in a bad relationship, but kept dealing with the conflict rather than just cutting it off because you had some shred of hope it could still work?

Both are cases of people's choices throwing them in situations that can cause them get depressed, or at least feel really shitty for a certain period of time.
I do have to disagree with the "Don't care if people don't understand depression cause they don't matter" point Sherlock made though. Although yes, those people absolutely should not matter to you on a personal level, they still matter on a societal level. Simply because if stuff like depression is to be more understood, accepted and helped people need to be able to understand it. We can't help, work with or hope to change something that we cannot understand. That's one of the main reasons charities like spreading awareness.