I've subscribed to this line of thinking my whole life, and mostly still do, but I've had to reassess after watching/listening to the case of Andres Iniesta, a professional footballer who sought professional help in the Summer of 2009. A starter for FC Barcelona and the Spanish national team, having just won the 2009 European Champions league with FC Barcelona and the 2008 European Championship with Spain. Multimillionaire and in peak physical condition, yet fell into a deep depression during the peak of his life. Definitely caused me to reassess my assumptions on clinical depression.