In order to most fully inhabit the only life you ever get, you have to refrain from using every spare hour for personal growth. - Oliver Burkeman

Ceaseless optimism about the future only makes for a greater shock when things go wrong; by fighting to maintain only positive beliefs about the future, the positive thinker ends up being less prepared, and more acutely distressed, when things eventually happen that he can't persuade himself to believe are good.

It's quite sufficient a challenge to seek to follow what the philosopher Iddo Landau calls the 'reverse golden rule' – that is, not treating yourself in punishing and poisonous ways in which you'd never dream of treating someone else. Can you imagine berating a friend in the manner that many of us deem it acceptable to screech internally at ourselves, all day long? Adam Phillips is exactly right: were you to meet such a person at a party, they'd immediately strike you as obviously unbalanced. You might try to get them to leave, and possibly also seek help. It might occur to you that they must be damaged – that in Phillips's words 'something terrible' must have happened to them – for them to think it appropriate to act that way.

keep two to-do lists, one "open" and one "closed." The open list is for everything that's on your plate and will doubtless be nightmarishly long. Fortunately, it's not your job to tackle it: instead, feed tasks from the open list to the closed one — that is, a list with a fixed number of entries, ten at most. The rule is that you can't add a new task until one's completed. (You may also require a third list, for tasks that are "on hold" until someone else gets back to you.)