Here is my theory:
Fill your mind with false beliefs and show wild and apparently unhinged excitement and energy (mania).
Fill your mind with a mix of false beliefs and realities and you'll be bipolar (manic-depressive).
Fill your mind with realities and you'll be depressed.
Your thoughts?
I agree. The last part I tried to explain to several "experts" but they didn't believe me that I was just realistic about my situation in life which can be (looking was going on in the world) being very depressing.
Yes I can relate to that,.
Hi I get this. It does show though that no extreme is liveable with. A mixture of all of these approaches with the emphasis on reality and grounded in reality is best.
You can't lead your life totally in any one of them x
I think there is plenty going on in the world that is depressing, and plenty that is encouraging and heartwarming. What you focus on may be a symptom of your state of mind, or what causes your state of mind. Try ignoring the news for a week, and finding good stories to read about on-line. See if it makes any difference to your depression.
Interesting discussion. I agree with all of the above.
Fill your mind with positive possibilities and you'll feel hopeful. 
Sorry to hijack but has anyone seen my latest post? I know it's long. But it's long for a reason. If you read one half, and then take a break and read the second half - it's not that bad.xx
Whatever it is I will agree. You see I cannot make my mind up what I am
BOB
Reality is different even for two people in the same room.
loosing my mind
How to explain our condition?
Negative thoughts are in my mind 
Is it you or is it me? Is a narcissistic parent causing your depression?
Little bit of a mind f***
