 Prichard works initially with Sidgwick’s contrast between intuitionism as the view that conduct is right when conforming to certain principles known to be unconditionally binding, and non-intuitionism as the view that there are ends at which we should aim. (The view that there are ends that we should do what we can to realize, which is a different view, is according to Prichard not Sidgwick’s official view, but a better view that Sidgwick should have adopted instead.)