§105

When we look at language as it is ordinarily used we find vagueness, words that seem to resist definition in terms of necessary and sufficient conditions, and a great variety of different kinds of sentences. If we think that there must be some kind of crystal clear logic underlying language then we are forced to look for it somewhere hidden beneath the (vague, heterogeneous) surface. Or perhaps we turn to thought rather than language.
What we in fact need to do is to recognise that we have made the ideal a requirement rather than thinking of it as something we might discover hidden somewhere.