For the painter then there is a limit to expression. He cannot proceed with his ideal higher than Praxiteles. His limit is the most supreme form and expression conceivable by his imagination, which does not exceed the apparent possibility of human experience. Apparent, because an ideal must necessarily be actually above the possibility of experience, but it may not appear to be so. For instance a Raphael Madonna does not seem to represent a supernatural woman. There is no single feature painted which cannot be matched in life, and hence it would not occur to the observer that the expression is contrary to the possibility of experience. But the expression cannot be met with in life, for besides being entirely general, it excludes all phases due to the emotions or passions. One cannot imagine a woman with the expression of a Raphael Madonna having concern with any special human interest, and least of all with feelings and failings arising from natural instincts. Yet the expression covers every form of noble endeavour; every phase of innocent pleasure; every degree of mental activity within the province of woman. And herein lies the art--the exclusion of the bad in our nature, with the exaltation of the good. Now it is obvious that if the expression be so general that no particular quality can be identified therein, the countenance will serve for the head of any personage painted in whose expression it is desirable to indicate the possession of high attributes, without suggesting a particular condition of mind. Thus, the head of a Raphael Madonna would equally serve for the head of a Saint Cecilia or a Judith; or, providing the age were suitable, for a heroine of the stamp of Joan of Arc, so long as the character of her actual features were unknown. Further it would be well adapted for a symbolical figure, as Prudence or Truth.