Last summer I spent a month with the Benedictine Sisters of St. Gertrude's Monastery in Cottonwood, Idaho. The nuns had granted me an artist residency: a whole month to work on a manuscript I was writing and read and engage in what they called "holy leisure."  It was one of the greatest blessings I've ever had to live with these faithful women. I joined them twice each day for morning and evening prayer, during which the nuns sang the psalms. They would sing…