'The artist must be blind to distinctions between 'recognised' or 'unrecognised' conventions of form, deaf to the transitory teaching and demands of his particular age. He must watch only the trend of the inner need, and hearken to its words alone. Then he will with safety employ means both sanctioned and forbidden by his contemporaries. All means are sacred which are called for by the inner need. All means are sinful which obscure the inner need'.