|Criteria: do not follow from a definition but must be developed. The criteria for the application of a concept to an object are more concerned with language practice in a community. E.g. the definition of truth does not provide a criterion for which sentences are true.|
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Knowledge/Thinking/Millikan: knowing what you think yourself is a posteriori knowledge, not a priori.
Problem: precisely then we need a criterion for thinking of something and a criterion of whether one can identify the real value of one's thoughts.
R. G. Millikan
Language, Thought, and Other Biological Categories: New Foundations for Realism Cambridge 1987