The bad news: beyond about a 125 IQ, it's the CCCP (courage, creativity, curiosity, passion) that actually matter as predictors of creative achievement, and those correlate slightly positively with biological mental illness[0], and very strongly with induced mental illness due to social adversity.
Society makes sure that the best people have fucked-up lives. That's well-documented. Fucked-up lives lead to mental illness. Also well-documented.