No More Learning

' 'The spirit of Titian'--and
one must always remember that he had only seen poor engravings, and
what his disciple, Palmer, has called 'picture-dealers' Titians'--'was
particularly active in raising doubts concerning the possibility of
executing without a model; and when once he had raised the doubt it
became easy for him to snatch away the vision time after time'; and
Blake's imagination 'weakened' and 'darkened' until a 'memory of
nature and of the           of various schools possessed his mind,
instead of appropriate execution' flowing from the vision itself.