"TRACTATUS LOGICO-PHILOSOPHICUS. Wittgenstein told Ludwig von Ficker that the point of the Tractatus was ethical. In the preface to the book he says that its value consists in two things: "that thoughts are expressed in it" and "that it shows how little is achieved when these problems are solved." The problems he refers to are the problems of philosophy defined, we may suppose, by the work of Frege and Russell, and perhaps also Schopenhauer. At the end of the book Wittgenstein says "My propositions serve as elucidations in the following way: anyone who understands me eventually recognizes them as nonsensical" [emphasis added]. What to make of the Tractatus, its author, and the propositions it contains, then, is no easy matter.
The book certainly does not seem to be about ethics. It consists of numbered propositions in seven sets. Proposition 1.2 belongs to the first set and is a comment on proposition 1. Proposition 1.21 is about proposition 1.2, and so on. The seventh set contains only one proposition, the famous "What we cannot speak about we must pass over in silence."
Some important and representative propositions from the book are these:
1 The world is all that is the case.
4.01 A proposition is a picture of reality.
4.0312 ...My fundamental idea is that the 'logical constants' are not representatives; that there can be no representatives of the logic of facts.
4.121 ...Propositions show the logical form of reality. They display it.
4.1212 What can be shown, cannot be said.
4.5 ...The general form of a proposition is: This is how things stand.
5.43 ...all the propositions of logic say the same thing, to wit nothing.
5.4711 To give the essence of a proposition means to give the essence of all description, and thus the essence of the world.
5.6 The limits of my language mean the limits of my world.
When a person says something what he or she means depends not only on what is said but also on the context in which it is said. Importance, point, meaning are given by the surroundings. Words, gestures, expressions come alive, as it were, only within a language game, a culture, a form of life. If a picture, say, means something then it means so to somebody. Its meaning is not an objective property of the picture in the way that its size and shape are. The same goes of any mental picture. Hence Wittgenstein's remark that "If God had looked into our minds he would not have been able to see there whom we were speaking of." Any internal image would need interpretation. If I interpret my thought as one of Hitler and God sees it as Charlie Chaplin, who is right? Which of the two famous contemporaries of Wittgenstein's I mean shows itself in the way I behave, the things I do and say. It is in this that the use, the meaning, of my thought or mental picture lies. "The arrow points only in the application that a living being makes of it."
RULES AND PRIVATE LANGUAGE. Without sharing certain attitudes towards the things around us, sharing a sense of relevance and responding in similar ways, communication would be impossible. It is important, for instance, that nearly all of us agree nearly all the time on what colors things are. Such agreement is part of our concept of color, Wittgenstein suggests. Regularity of the use of such concepts and agreement in their application is part of language, not a logically necessary precondition of it. We cannot separate the life in which there is such agreement from our concept of color. Imagine a different form or way of life and you imagine a different language with different concepts, different rules and a different logic.
This raises the question of the relation between language and forms or ways of life. For instance, could just one person have a language of his or her own? To imagine an individual solitary from birth is scarcely to imagine a form of life at all, but more like just imagining a life- form. Moreover, language involves rules establishing certain linguistic practices. Rules of grammar express the fact that it is our practice to say this (e.g. "half past twelve") and not that (e.g. "half to one"). Agreement is essential to such practices. Could a solitary individual, then, engage in any practice, including linguistic ones? With whom could he or she agree? This is a controversial issue in the interpretation of Wittgenstein. Gordon Baker and P.M.S. Hacker hold that such a solitary man could speak his own language, follow his own rules, and so on, agreeing, over time, with himself in his judgements and behavior. Orthodoxy is against this interpretation, however. "