The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Theaetetus by Plato: as in the Eleatic philosophy, applied to the sensible world, and again used
in the more ordinary sense of opinion. There is no connexion between
sensible appearance and probability, and yet both of them met in the word
doxa, and could hardly be disengaged from one another in the mind of the
Greek living in the fifth or fourth century B.C. To this was often added,
as at the end of the fifth book of the Republic, the idea of relation,
which is equally distinct from either of them; also a fourth notion, the
conclusion of the dialectical process, the making up of the mind after she
has been 'talking to herself' (Theat.).
We are not then surprised that the sphere of opinion and of Not-being
should be a dusky, half-lighted place (Republic), belonging neither to the
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