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The result of philosophy is not a number of "philosophical propositions", but to make propositions clear.
Philosophy should make clear and delimit sharply the thoughts which otherwise are, as it were, opaque and blurred.
4.1121    Psychology is no nearer related to philosophy, than is any other natural science.
The theory of knowledge is the philosophy of psychology.
Does not my study of sign-language correspond to the study of thought processes which philosophers held to be so essential to the philosophy of logic? Only they got entangled for the most part in un-essential psychological investigations, and there is an analogous danger for my method.
4.1122    The Darwinian theory has no more to do with philosophy than has any other hypothesis of natural science.