Clinically speaking, depression is a pessimistic sense of your own capabilities, and despondent lack of energy.
Jane McGonigalAny time I consider a new project, I ask myself, is this pushing the state of gaming toward Nobel Prizes? If it's not, then it's not doing anything important enough to spend my time.
Jane McGonigalA game is an opportunity to focus our energy, with relentless optimism, at something weโre good at (or getting better at) and enjoy. In other words, gameplay is the direct emotional opposite of depression.
Jane McGonigal