Wittgenstein's solipsist from Tractatus. Some things is posted in the Tractatus reading group thread page 14.
5.6
The limits of my language mean the limits of my world.
— T
What is the significance of his shift from language and the world to “my language” and “my world”? The self cannot be found in the world. It can play no part in logical relationships, and propositions about it are nonsense. My world and my language do not connote a relationship between facts or objects.
My language means not simply English or German but the way in which I represent reality.
5.61
Logic pervades the world: the limits of the world are also its limits.
So we cannot say in logic, ‘The world has this in it, and this, but not that.’
For that would appear to presuppose that we were excluding certain possibilities, and this cannot be the case, since it would require that logic should go beyond the limits of the world; for only in that way could it view those limits from the other side as well.
We cannot think what we cannot think; so what we cannot think we cannot say either.
— T
The logical relationships within the world are not the only relationships. There is also a relationship between the “I” and the world.
5.62
This remark provides the key to the problem, how much truth there is in solipsism.
For what the solipsist means is quite correct; only it cannot be said, but makes itself manifest.
The world is my world: this is manifest in the fact that the limits of language (of that language which alone I understand) mean the limits of my world.
— T
In what way does the limits of language show that the world is my world? Suppose someone were to reject W.’s claim saying: “There must be more to my world”, to which the response would be: “What more is there”? And of course no answer could be given. If an answer could be given, whatever is said would be within that limit. I take this to be a form of skepticism. He is not denying that there may be more than I can say or think but that it is nonsense to say this because it does not point to anything. It does not mark a limit to the world or to language but to my world and the language I understand. But the same is true for all of us.
Solipsism - solus "alone" and ipse "self”. That language which alone I understand, is that language which solus ipse is understood. If there is a language I do not understand then even though the propositions are in proper logical order to picture reality, they are for me without sense (sinnlos) because I do not know what state of affairs they represent. They cannot represent if they cannot be understood.
5.621
The world and life are one.
5.63
I am my world. (The microcosm.)
— T
The world is all that is the case (1). The facts that make up the world are not independent of the subject who perceives and represents those facts. This is the point of the cube having two facts. Facts are not independent of their representation. A picture is a fact. (2.141)The facts of the world include the representation of facts.
5.631
There is no such thing as the subject that thinks or entertains ideas.
If I wrote a book called The World as I found it, I should have to include a report on my body, and should have to say which parts were subordinate to my will, and which were not, etc., this being a method of isolating the subject, or rather of showing that in an important sense there is no subject; for it alone could not be mentioned in that book.—
5.632
The subject does not belong to the world: rather, it is a limit of the world.
— T
“It alone could not be mentioned”, solus ipse. The I (ipse) alone (solus) that writes the book is not something that is found in the book.
5.633
Where in the world is a metaphysical subject to be found?
You will say that this is exactly like the case of the eye and the visual field. But really you do not see the eye.
And nothing in the visual field allows you to infer that it is seen by an eye.
— T
The subject is metaphysical because it is not a part of the physical world. Propositions about it are nonsense, for it does not represent anything in the world.
That which sees is not something seen. Just as the eye is not in visual space, the subject is not in logical space. The subject that represents is not something represented.
5.634
This is connected with the fact that no part of our experience is also a priori.
Everything we see could also be otherwise.
Everything we describe at all could also be otherwise.
There is no order of things a priori.
— T
What is the connection between the metaphysical subject and the contingency of facts?
5.64
Here we see that solipsism strictly carried out coincides with pure realism. The I in solipsism shrinks to an extensionless point and there remains the reality co-ordinated with it.
— T
The I alone which sees the world, that experiences, that describes, has no logical connection to the world. We can only say how things are, not how they must be or will be.
5.641
There is therefore really a sense in which the philosophy we can talk of a non-psychological I.
The I occurs in philosophy through the fact that the “world is my world”.
The philosophical I is not the man, not the human body or the human soul of which psychology treats, but the metaphysical subject,
the limit—not a part of the world.
— T
My world is the world I see, the world I experience, the life I lead. My limits are its limits.
The soul is not part of the natural world.
The “I” plays a role in determining the facts.
There is a limit to knowledge based on the fact that we cannot identify or name all of the simple objects.
“My language” means not simply English or German but the way in which I represent reality.
There is a relationship between the “I” which is not a part of the world it represents factually.
Solipsism: The “I” alone (solus "alone" and ipse "self”) is a limit of the world, the limit of what I can say and think. This is not a fixed limit, since it is always possible to learn something new, but a limit nonetheless. We cannot step out beyond ourselves.
The facts that make up the world are not independent of the subject who perceives and represents those facts. Facts are not independent of their representation. My world, the microcosm, is the world as I represent it.
“It alone could not be mentioned”, solus ipse. The I (ipse) alone (solus) that writes the book (The World as I found it) is not something that is found in the book. The I is a limit of the world.
The subject is metaphysical because it is not a part of the physical world. Propositions about it are nonsense, for it does not represent anything in the world. That which sees is not something seen. Just as the eye is not in visual space, the subject is not in logical space. The subject that represents is not something represented.
The I alone which sees the world, that experiences, that describes, has no logical connection to the world. We can only say how things are, not how they must be or will be.
My world is the world I see, the world I experience, the life I lead. My limits are its limits.
The self or I or soul or subject is free. It is not a part of the world. The world is for each of us mine - my world, the world as I perceive it, the world as I represent it in my language, the world as I live it. The limits of my world are not the limits of the world. This limit marks a form of skepticism.