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 v… - 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.

I asked him what he thought was the biggest barrier to happiness for most people. ‘It’s just a total absence of awareness, except for the thoughts that are continuously passing through your mind. It is the state of being so identified with the voices in your head’ – and at this point he emitted a tight Germanic chuckle – ‘that you think you are the voices in your head.

Incremental theory' people are different. Because they think of abilities as emerging through tackling challenges, the experience of failure has a completely different meaning for them: it's evidence that they are stretching themselves to their current limit. If they weren't, they wouldn't fail. The relevant analogy here is with weight training; muscles grow by being pushed to the limits of their current capacity, where fibres tear and reheal. Among weightlifters, 'training to failure' isn't an admission of defeat – it's a strategy.