If James did not lend the plane to William, he could only get his gain of a plank by working with it himself, and wearing it out himself. When he had worn it out at the end of the year, he would, therefore, have to make another for himself. William, working with it instead, gets the advantage instead, which he must, therefore, pay James his plank for; and return to James, what James would, if he had not lent his plane, then have had--not a new plane--but the worn-out one, James must make a new one for himself, as he would have had to do if no William had existed; and if William likes to borrow it again for another plank--all is fair. That is to say, clearing the story of its nonsense, that James makes a plane annually, and sells it to William for its proper price, which, in kind, is a new plank. But this arrangement has nothing whatever to do with principal or with interest. There are, indeed, many very subtle conditions involved in any sale; one among which is the value of ideas; I will explain that value to you in the course of time; (the article is not one which modern political economists have any familiarity with dealings in;) and I will tell you somewhat also of the real nature of interest; but if you will only get, for the present, a quite clear idea of "the Position of William," it is all I want of you. I remain, your faithful friend, JOHN RUSKIN. FORS CLAVIGERA. LETTER II. Denmark Hill, 1st February, 1871. Friends,-- Before going farther, you may like to know, and ought to know, what I mean by the title of these Letters; and why it is in Latin. I can only tell you in part, for the Letters will be on many things, if I am able to carry out my plan in them; and that title means many things, and is in Latin, because I could not have given an English one that meant so many. We, indeed, were not till lately a loquacious people, nor a useless one; but the Romans did more, and said less, than any other nation that ever lived; and their language is the most heroic ever spoken by men. Therefore I wish you to know, at least, some words of it, and to recognize what thoughts they stand for. Some day, I hope you may know--and that European workmen may know--many words of it; but even a few will be useful. Do not smile at my saying so. Of Arithmetic, Geometry, and Chemistry, you can know but little, at the utmost; but that little, well learnt, serves you well. And a little Latin, well learnt, will serve you also, and in a higher way than any of these. 'Fors' is the best part of three good English words, Force, Fortitude, and Fortune. I wish you to know the meaning of those three words accurately. 'Force' (in humanity), means power of doing good work. A fool, or a corpse, can do any quantity of mischief; but only a wise and strong man, or, with what true vital force there is in him, a weak one, can do good.