And my readers may depend upon it, that all blame which I express in this sweeping way is trustworthy. I have often had to repent of over- praise of inferior men; and continually to repent of insufficient praise of great men; but of broad condemnation, never. For I do not speak it but after the most searching examination of the matter, and under stern sense of need for it: so that whenever the reader is entirely shocked by what I say, he may be assured every word is true.[Footnote: He must, however, be careful to distinguish blame-- however strongly expressed, of some special fault or error in a true painter,--from these general statements of inferiority or worthlessness. Thus he will find me continually laughing at Wilson's tree-painting; not because Wilson could not paint, but because he had never looked at a tree.] It is just because it so much offends him, that it was necessary: and knowing that it must offend him, I should not have ventured to say it, without certainty of its truth. I say "certainty," for it is just as possible to be certain whether the drawing of a tree or a stone is true or false, as whether the drawing of a triangle is; and what I mean primarily by saying that a picture is in all respects worthless, is that it is in all respects False: which is not a matter of opinion at all, but a matter of ascertainable fact, such as I never assert till I have ascertained. And the thing so commonly said about my writings, that they are rather persuasive than just; and that though my "language" may be good, I am an unsafe guide in art criticism, is, like many other popular estimates in such matters, not merely untrue, but precisely the reverse of the truth; it is truth, like reflections in water, distorted much by the shaking receptive surface, and in every particular, upside down. For my "language," until within the last six or seven years, was loose, obscure, and more or less feeble; and still, though I have tried hard to mend it, the best I can do is inferior to much contemporary work. No description that I have ever given of anything is worth four lines of Tennyson; and in serious thought, my half-pages are generally only worth about as much as a single sentence either of his, or of Carlyle's. They are, I well trust, as true and necessary; but they are neither so concentrated nor so well put. But I am an entirely safe guide in art judgment: and that simply as the necessary result of my having given the labour of life to the determination of facts, rather than to the following of feelings or theories. Not, indeed, that my work is free from mistakes; it admits many, and always must admit many, from its scattered range; but, in the long run, it will be found to enter sternly and searchingly into the nature of what it deals with, and the kind of mistake it admits is never dangerous, consisting, usually, in pressing the truth too far. It is quite easy, for instance, to take an accidental irregularity in a piece of architecture, which