Argues that, in acting for a reason, one takes that reason to explain one's action, not to justify it: reasons for acting need not be seen "under the guise of the good". The argument turns on the need to explain the place of "practical knowledge" - knowing what one is doing - in intentional action. A revised and expanded version of this material appears in Part One of "Reasons without Rationalism" (Princeton, 2007).

Argues that practical irrationality is akin to moral culpability: it is defective practical thought which one could legitimately have been expected to avoid. It is thus a mistake to draw too tight a connection between failure to be moved by reasons and practical irrationality (as in a certain kind of "internalism"): one's failure may be genuine, but not culpable, and therefore not irrational.