In An Unquiet Mind, the gold standard of bipolar memoirs, psychologist Kay Redfield Jamison says the same thing: that she was the most productive and most brilliant on the way to mania--until she became psychotic.
From personal experience I would argue that it's true that for some people, it's a thin line between brilliance and mania. I have never reached the heights of brilliance and mania that Moezzi and Jamison describe, but I know what it's like to walk that line between sanity and insanity. Most of the time I stay on the side where I know the rules and try to follow them as obsessively as possible.
But there have been periods where I have had one foot in this world and one foot in the other. A world where the lines between black and white, good and bad, and reality and fantasy are blurred. I have had some of my best insights at those times, but I was also the most reckless during those periods. It is both freeing and dangerous.
At those times, I pay close attention to where I'm standing and do my best to maintain my balance.
Three of the six people in my family are bipolar, and they have all been described as the kind of people who light up a room when they walk in. But when they are manic their light is blinding, and they can no longer see how they are hurting themselves and other people with their actions.
Sometimes people with bipolar disorder don't want to take their meds because they don't want to dull their creative side. And it's true that when you've reached the peak of mania the drugs you take are meant to put out the fire, so they dampen everything for awhile.
It often takes a person with bipolar disorder many years before they can reach this place of self-acceptance, as these authors demonstrate. But they also demonstrate that you can still be brilliant when you're stable.