# The correctness of our philosophical system will be tested by comparisons between the… by John McCarthy and Patrick Hayes > "The correctness of our philosophical system will be tested by comparisons between the beliefs of the program and our observations." > **— John McCarthy and Patrick Hayes**, *Some Philosophical Problems from the Standpoint of Artificial Intelligence (1969), excerpt candidate* Verification Status: Unverified — exact wording/source has not yet been independently confirmed against a primary source; source clue: Some Philosophical Problems from the Standpoint of Artificial Intelligence (1969), excerpt candidate.