 One might understand the reasoning here in the following way: because it is built into our conception of rationality that our own particular grasp of rationality may be mistaken on any given occasion and is also inherently limited, no statement of psychological or psychophysical generalizations could exhaust, and therefore explain, our conception of rationality. If the concept of rationality does not simply consist in one’s conception, at any given time, of rationality, then it cannot be captured in terms of the actual goings on in one’s brain (the same point applies if we substitute “everyone’s” for “one’s”). Therefore, strict lawlike relations between the mental and the physical are impossible. This contrasts interestingly with Kim’s strategy: on McDowell’s reading, it is partly because no detailed statement of a rational principle could be claimed to be necessarily true that there can be no psychophysical laws.