“A person who has resolved to ‘think positive’ must constantly scan his or her mind for negative thoughts – there’s no other way that the mind could ever gauge its success at the operation – yet that scanning will draw attention to the presence of negative thoughts.”

“Mainly, it’s not that there are things you can’t say. It’s that there are things you can’t say without the risk that people who previously lacked a voice might use their own freedom of speech to object.”

“I came to understand that happiness and vulnerability are often the same thing.”

“A person who has resolved to ‘think positive’ must constantly scan his or her mind for negative thoughts – there’s no other way that the mind could ever gauge its success at the operation – yet that scanning will draw attention to the presence of negative thoughts.”

“...no matter how much success you may experience in life, your eventual story - no offence intended - will be one of failure. Your bodily organs will fail, and you'll die.”

“...it pointed to an alternative approach, a ‘negative path’ to happiness, that entailed taking a radically different stance towards those things that most of us spend our lives trying to avoid. It involved learning to enjoy uncertainty, embracing insecurity, stopping trying to think positively, becoming familiar with failure, even learning to value death. In short, all these people seemed to agree that in order to be truly happy, we might actually need to be willing to experience more negative emotions—or, at the very least to learn to stop running quite so hard from them.”

“Part of the problem with positive thinking, and many related approaches to happiness, is exactly this desire to reduce big questions to one-size-fits-all self-help tricks or ten point plans.”

“...once you have resolved to embrace the ideology of positive thinking, you will find a way to interpret virtually any eventuality as a justification for thinking positively. You need never spend time considering how your actions might go wrong.”

“Who says you need to wait until you 'feel like' doing something in order to start doing it? The problem, from this perspective, isn't that you don't feel motivated; it's that you imagine you need to feel motivated. If you can regard your thoughts and emotions about whatever you're procrastinating on as passing weather, you'll realise that your reluctance about working isn't something that needs to be eradicated or transformed into positivity. You can coexist with it. You can note the procrastinatory feelings and act anyway.”

“And here lies the essential difference 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.”

“Through positive thinking and related approaches, we seek the safety and solid ground of certainty, of knowing how the future will turn out, of a time in the future when we'll be ceaselessly happy and never have to fear negative emotions again. But in chasing all that, we close down the very faculties that permit the happiness we crave.”