Full Idea
All moral theories, intuitionist, naturalistic, objectivist, emotive, and the rest, in so far as they are philosophical theories, are neutral as regards actual conduct; they belong to the field of meta-ethics, not ethics proper.
Gist of Idea
Moral theories are all meta-ethical, and are neutral as regards actual conduct
Source
A.J. Ayer (On the analysis of moral judgements [1949])
Book Reference
Ayer,A.J.: 'Philosophical Essays' [Macmillan 1965], p.246
A Reaction
Interestingly, Ayer doesn't seem willing to accept 'ethics proper' as being 'philosophical'. Given the modern rise of applied ethics, it seems suprising to say that even normative ethics is not philosophical. Utilitarianism seems not to be philosophical.