Richard Reid, the would-be 'shoe bomber', had been tackled and subdued on board a flight from Paris to Miami, thereby initiating the era of compulsor… - Oliver Burkeman

The advice of etiquette experts on dealing with unwanted invitations, or overly demanding requests for favours, has always been the same: just say no. That may have been a useless mantra in the war on drugs, but in the war on relatives who want to stay for a fortnight, or colleagues trying to get you to do their work for them, the manners guru Emily Post's formulation – 'I'm afraid that won't be possible' – remains the gold standard. Excuses merely invite negotiation. The comic retort has its place (Peter Cook: 'Oh dear, I find I'm watching television that night'), and I'm fond of the tautological non-explanation ('I can't, because I'm unable to'). But these are variations on a theme. The best way to say no is to say no. Then shut up.

It's alarming to face the prospect that you might never truly feel as though you know what you're doing, in work, marriage, parenting, or anything else. But it's liberating, too, because it removes a central reason for feeling self-conscious or inhibited about your performance in those domains in the present moment: if the feeling of total authority is never going to arrive, you might as well not wait any longer to give such activities your all — to put bold plans into practice, to stop erring on the side of caution. It is even more liberating to reflect that everyone else is in the same boat, whether they're aware of it or not.

We've been granted the mental capacities to make almost infinitely ambitious plans, yet practically no time at all to put them into action.