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Full Idea
From the fact that an object is truly described as "a man", it follows that you ought to accept relevantly similar objects as men.
Gist of Idea
If this is a man, you ought to accept similar things as men
Source
John Searle (Rationality in Action [2001], Ch.5.IV)
Book Ref
Searle,John R.: 'Rationality in Action' [MIT 2001], p.160