in recent years, some psychologists have reached the conclusion that pessimism may often be as healthy and productive as optimism. - Oliver Burkeman

And here lies the essential between Stoicism and the modern-day 'cult of optimism.' For the Stoics, the ideal state of mind was tranquility, not the excitable cheer that positive thinkers usually seem to mean when they use the word, 'happiness.' And tranquility was to be achieved not by strenuously chasing after enjoyable experiences, but by cultivating a kind of calm indifference towards one's circumstances.

Because our problem, it turns out, was never that we hadn't yet found the right way to achieve control over life, or safety from life. Our real problem was imagining that any of that might be possible in the first place for finite humans, who, after all, just find themselves unavoidably in life, with all the limitations and feelings of claustrophobia and lack of escape routes that entails. ('Our suffering,' as Mel Weitsman, another Zen teacher, puts it, 'is believing there's a way out.')

how normal it has become to feel as though you absolutely must do more than you can do.