The Cima differs from the Rembrandt, by being lovely; from the Botticelli, by being simple and calm. The painter does not desire the excitement of rapid movement, nor even the passion of beautiful light. But he hates darkness as he does death; and falsehood more than either. He has painted a noble human creature simply in clear daylight; not in rapture, nor yet in agony. He is dressed neither in a rainbow, nor bedraggled with blood. You are neither to be alarmed nor entertained by anything that is likely to happen to him. You are not to be improved by the piety of his expression, nor disgusted by its truculence. But there is more true mastery of light and shade, if your eye is subtle enough to see it, in the hollows and angles of the architecture and folds of the dress, than in all the etchings of Rembrandt put together. The unexciting color will not at first delight you; but its charm will never fail; and from all the works of variously strained and obtrusive power with which it is surrounded, you will find that you never return to it but with a sense of relief and of peace, which can only be given you by the tender skill which is wholly without pretense, without pride, and without error.
61. The distinctions between schools of art which I have so often asked you to observe are, you must be aware, founded only on the excess of certain qualities in one group of painters over another, or the difference in their tendencies; and not in the absolute possession by one group, and absence in the rest, of any given skill. But this impossibility of drawing trenchant lines of parting need never interfere with the distinctness of our conception of the opponent principles which balance each other in great minds, or paralyze each other in weak ones; and I cannot too often urge you to keep clearly separate in your thoughts the school which I have called[11] "of Crystal," because its distinctive virtue is seen unaided in the sharp separations and prismatic harmonies of painted glass, and the other, the "School of Clay," because its distinctive virtue is seen in the qualities of any fine work in uncolored terra cotta, and in every drawing which represents them.
[Footnote 11: "Lectures on Art, 1870," § 185.]