He [ Michelangelo ] did not know a single one of the feelings of man, not one of his passions. When he was making an arm or a leg, it seems as if he were thinking only of that arm or leg and was not giving the slightest consideration to the way it relates with the action of the figure to which it belongs, much less to the action of the picture as a whole... Therein lies his great merit; he brings a sense of the grand and the terrible into even an isolated limb.