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The common term under which, through the accidental use of

language, two entirely different ideas were included was another

source of confusion. Thus through the ambiguity of (Greek) Plato,

attempting to introduce order into the first chaos of human

thought, seems to have confused perception and opinion, and to

have failed to distinguish the contingent from the relative. In

the Theaetetus the first of these difficulties begins to clear

up; in the Sophist the second; and for this, as well as for other

reasons, both these dialogues are probably to be regarded as

later than the Republic.