The artistic temperament is a disease that afflicts amateurs. It is a disease which arises from men not having sufficient power of expression to utter and get rid of the element of art in their being. It is healthful to every sane man to utter the art within him; it is essential to every sane man to get rid of the art within him at all costs. Artists of a large and wholesome vitality get rid of their art easily, as they breathe easily, or perspire easily. But in artists of less force, the thing becomes a pressure, and produces a definite pain, which is called the artistic temperament. Thus, very great artists are able to be ordinary men—men like Shakespeare or Browning. There are many real tragedies of the artistic temperament, tragedies of vanity or violence or fear. But the great tragedy of the artistic temperament is that it cannot produce any art.
~G. K. Chesterton, “The Wit of Whistler” in Heretics