He's not saying you can completely control your moods 100%. He's basically saying be mindful of the factors you can control. We are bipolar and no matter what we think, we are going to have episodes and mood swings...I think we can all agree on that. This is a good coping mechanism if you make the effort to change some ways of thinking and rationalize things it can help...listen if there was a cure-all and it was just a mindset none of us would be here and none of us would need meds...unfortunately the reality is that we do need meds. We just need to realize that the meds won't do all the work for us. We have to make a conscious effort to help ourselves.