"Nietzsche's Moral and Political Philosophy"--New Version on SEP

Here. Changes mainly in the section on Nietzsche's political philosophy, including mention of Shaw.

Help Sought: Looking for a Nietzsche Quote

Nietzsche holds the typical naturalist's view that the correct explanation of the purportedly binding force of norms--epistemic, ethical, even logical--is to be given in entirely psychological terms: it is just that creatures like us "feel" that it would be wrong to believe what is unwarranted, or violate a logical canon. He has a particularly striking comment in this vein psychologizing logic. Might anyone have an idea where? I had thought in Nachlass material, but haven't found it, so perhaps elsewhere.

Many thanks.