Full Idea
A moral philosopher will have his moral standards and will sometimes make moral judgements, but these moral judgements cannot be a logical consequence of his philosophy.
Gist of Idea
Moral judgements cannot be the logical consequence of a moral philosophy
Source
A.J. Ayer (On the analysis of moral judgements [1949], p.247)
Book Reference
Ayer,A.J.: 'Philosophical Essays' [Macmillan 1965], p.247
A Reaction
I take this to be an assertion of the is-ought distinction. Personally this strikes me as totally false. Ayer needs to think more deeply about moral philosophy!