§ XXXIII. There were, of course, noble exceptions; but chiefly belonging to the earliest periods of the Renaissance, when its teaching had not yet produced its full effect. Raphael, Leonardo, and Michael Angelo were all trained in the old school; they all had masters who knew the true ends of art, and had reached them; masters nearly as great as they were themselves, but imbued with the old religious and earnest spirit, which their disciples receiving from them, and drinking at the same time deeply from all the fountains of knowledge opened in their day, became the world's wonders. Then the dull wondering world believed that their greatness rose out of their new knowledge, instead of out of that ancient religious root, in which to abide was life, from which to be severed was annihilation. And from that day to this, they have tried to produce Michael Angelos and Leonardos by teaching the barren sciences, and still have mourned and marvelled that no more Michael Angelos came; not perceiving that those great Fathers were only able to receive such nourishment because they were rooted on the rock of all ages, and that our scientific teaching, nowadays, is nothing more nor less than the assiduous watering of trees whose stems are cut through. Nay, I have even granted too much in saying that those great men were able to receive pure nourishment from the sciences; for my own conviction is, and I know it to be shared by most of those who love Raphael truly,--that he painted best when he knew least. Michael Angelo was betrayed, again and again, into such vain and offensive exhibition of his anatomical knowledge as, to this day, renders his higher powers indiscernible by the greater part of men; and Leonardo fretted his life away in engineering, so that there is hardly a picture left to bear his name. But, with respect to all who followed, there can be no question that the science they possessed was utterly harmful; serving merely to draw away their hearts at once from the purposes of art and the power of nature, and to make, out of the canvas and marble, nothing more than materials for the exhibition of petty dexterity and useless knowledge. § XXXIV. It is sometimes amusing to watch the naïve and childish way in which this vanity is shown. For instance, when perspective was first invented, the world thought it a mighty discovery, and the greatest men it had in it were as proud of knowing that retiring lines converge, as if all the wisdom of Solomon had been compressed into a vanishing point. And, accordingly, it became nearly impossible for any one to paint a Nativity, but he must turn the stable and manger into a Corinthian arcade, in order to show his knowledge of perspective; and half the best architecture of the time, instead of being adorned with historical sculpture, as of old, was set forth with bas-relief of minor corridors and galleries, thrown into perspective.