The effort to feel happy is often precisely the thing that makes us miserable. And that it is out constant efforts to eliminate the negative - insecurity, uncertainty, failure, or sadness - that is what causes us to feel so insecure, anxious, uncertain, or unhappy.

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.

...It's more important than ever that we find new ways to cultivate curiosity - because our careers, our happiness, and our children's flourishing all depend upon it.

Ask yourself whether you are happy', observed the philosopher John Stuart Mill, 'and you cease to be so.' At best, it would appear, happiness can only be glimpsed out of the corner of an eye, not stared at directly.

Confronting the worst-case scenario saps it of much of its anxiety-inducing power. Happiness reached via positive thinking can be fleeting and brittle, negative visualization generates a vastly more dependable calm.

Reassurance can actually exacerbate anxiety: when you reassure your friend that the worst-case scenario he fears probably won't occur, you inadvertently reinforce his belief that it would be catastrophic if it did. You are tightening the coil of his anxiety, not loosening it. All to often, the Stoics point out, things will not turn out for the best.

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.