A great emotion is too selfish; it takes into itself all the blood of the spirit, and the congestion leaves the hands too cold to write. Three sorts of emotion produce great poetry — strong but quick emotions, seized upon for art as soon as they have passed, but not before they have passed; strong and deep emotions in their remembrance a long time after; and false emotions, that is to say, emotions felt in the intellect. Not insincerity, but a translated sincerity, is the basis of all art.

Fernando Pessoa