The digital era is beset by distraction, and it feels like things are only getting worse. At times like these, the distant past beckons as a golden age of attention. We fantasize about escaping our screens. We dream of recapturing the quiet of a world with less noise. We imagine retreating into solitude and singlemindedness, almost like latter-day monks.
But although we think of early monks as master concentrators, a life of mindfulness did...