"And yet, we know how fatal the pursuit of liveliness may be: it may result in ... tiresome acrobatics. ... Flashy effects distract the mind. They destroy their persuasiveness; you would not believe a man was very intent on ploughing a furrow if he carried a hoop with him and jumped through it at every other step. ... When virtuosity gets the upper hand of your theme, or is better than your idea, it is time to quit."