Wittgenstein critically examines what is knowledge. What he says is a single proposition like "I know that the world is round" does not stand alone. It stands with a whole lot of other un-expressed propositions. When taken singularly we cannot prove any knowledge exists.
I feel the way out of this is to find out what do we do with knowledge? "The world is round" we say it to others, we write this in books.
Pre-processing knowledge is, what happens before we acquire the knowledge. We might have reward in a book that the world is round.
Purpose of a proposition is to pass a message. The massage may be to another person or to oneself. To another when we are communicating, and to oneself when we are thinking.
The complex part is the thinking. Even, when a message is passed tho another, that person will start thinking. So the result of a proposition is thinking.
There are many aspects for the process of thinking. One will be producing more propositions. These will in turn create more propositions. This is the process of thinking. But this can't be the end. It the thinking process will be useless.
The end result may be messaging the senses to react or chemicals released in the brain or body, which also ends in messaging the senses.
What would be like this process happening inside a computer.
Methods of messaging can be broken to two. Internal messaging and external messaging. Internal is when you are thinking, external is when you express your thoughts vertically, in writing or from any other method.
Moore's "this is my hand" is external, in this instance he tries to do it by dual modes, verbal and visual. May be, dual mode has stronger effect of passing the message across. Wittgenstein's "saying is not sufficient, you need to show" may also uses the dual mode.
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