There is nothing noisier than silence, if your head is full of words. Escape the clamour of the city and at once an excited voice enthuses about the quiet. “How wonderful,” you tell yourself getting out of the car, “to have made it up to the Highlands, to have fled the traffic and the TV and the strident voices round the dinner table. Fantastic!” You strike off along a path through pine trees – isn’t the hush extraordinary! – and before you know it yesterday’s argument with your wife is playing out in your head. How could she have said that! “You’re lucky you still have someone to insult.” That would have been the smart answer. Why didn’t I think …