“The unity of style not only of the Christian Middle Ages but of the Renaissance expresses in each case the different structure of social power, and not the obscure experience of the oppressed in which the general was enclosed. The great artists were never those who embodied a wholly flawless and perfect style, but those who used style as a way of hardening themselves against the chaotic expression of suffering, as a negative truth. The style of their works gave what was expressed that force without which life goes unheard”