“Nesse’s research focuses on the evolutionary origins of depression. Why does depression exist at all? If it’s stayed in our gene pool for so long, he argues, there must be some evolutionary benefit. Nesse believes that depression may be an adaptive mechanism meant to prevent us from falling victim to blind optimism—and squandering resources on the wrong goals.11 It’s to our evolutionary advantage not to waste time and energy on goals we can’t realistically achieve. And so when we have no clear way to make productive progress, our neurological systems default to a state of low energy...”

“Complaining does not work as a strategy. We all have finite time and energy. Any time we spend whining is unlikely to help us achieve our goals. And it won't make us happier.”

“Considering that we live in an era of evolutionary everything---evolutionary biology, evolutionary medicine, evolutionary ecology, evolutionary psychology, evolutionary economics, evolutionary computing---it was surprising how rarely people thought in evolutionary terms. It was a human blind spot. We look at the world around us as a snapshot when it was really a movie, constantly changing.”

“A game is an opportunity to focus our energy, with relentless optimism, at something we’re good at (or getting better at) and enjoy. In other words, gameplay is the direct emotional opposite of depression.”

“Katz had read extensively in popular sociobiology, and his understanding of the depressive personality type and its seemingly perverse persistence in the human gene pool was that depression was successful adaptation to ceaseless pain and hardship. Pessimism, feelings of worthlessness and lack of entitlement, inability to derive satisfaction from pleasure, a tormenting awareness of the world's general crappiness: for Katz Jewish paternal forebears, who'd been driven from shtetl to shtetl by implacable anti-Semites, as for the old Angles and Saxons on his mother's side, who'd labored to grow rye and barley in the poor soils and short summers of northern Europe, feeling bad all the time and expecting the worse had been natural ways of equilibriating themselves with the lousiness of their circumstances. Few things gratified depressives, after all, more than really bad news. This obviously wasn't an optimal way to live, but it had its evolutionary advantages.”

“If you took one-tenth the energy you put into complaining and applied it to solving the problem, you'd be surprised by how well things can work out... Complaining does not work as a strategy. We all have finite time and energy. Any time we spend whining is unlikely to help us achieve our goals. And it won't make us happier.”