Ceaseless optimism about the future only makes for a greater shock when things go wrong; by fighting to maintain only positive beliefs about the futu… - Oliver Burkeman

our lives, thanks to their finitude, are inevitably full of activities that we're doing for the very last time. Just as there will be a final occasion on which I pick up my son — a thought that appalls me, but one that's hard to deny, since I surely won't be doing it when he's thirty — there will be a last time that you visit your childhood home, or swim in the ocean, or make love, or have a deep conversation with a certain close friend. Yet usually there'll be no way to know, in the moment itself, that you're doing it for the last time. Harris's point is that we should therefore try to treat every such experience with the reverence we'd show if it were the final instance of it. And indeed there's a sense in which every moment of life is a "last time." It arrives; you'll never get it again — and once it's passed, your remaining supply of moments will be one smaller than before. To treat all these moments solely as stepping-stones to some future moment is to demonstrate a level of obliviousness to our real situation that would be jaw-dropping if it weren't for the fact that we all do it, all the time.

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.

What is anxiety? It is the next day. With whom, then, does the pagan contend in anxiety? With himself, with a delusion, because the next day is a powerless nothing if you yourself do not give it your strength.' – SØREN KIERKEGAARD