In the biography of Leonardo da Vinci, Antonio Vallenten tells of a time when the great artist was at work in Milan on his famous painting of the Last Supper. Da Vinci spent many hours meditating in the chapel of the monastery where he was working. The monks resented these "idle periods" and accused the artist of wasting time. But da Vinci defended these periods of reflection by saying, "When I pause the longest, I make the most telling strokes with my brush."