Sowell's Principle

I'm not planning to make 'Quote of the Day' a daily feature, but I couldn't resist this from the great American economist (and wonderfully lucid writer) Thomas Sowell, who turns 90 today:

'I write only when I have something to say. The big disadvantage of this is that it can mean a lot of down time.'

This can also, of course, be seen as a big advantage, for those not obliged to earn their living by writing...
There are all too many writers – perhaps a majority – who clearly don't live by Sowell's principle.