Not, on this view, in the sense that what A believes is true, and what believes is not; for what A is believing is merely that the idea of not doing good to your enemies tends to excite in him a feeling of moral indignation, and what believes is merely that it does not tend to excite this feeling in him and both beliefs may perfectly well be true; it may really be true that the same actions do excite the feeling in, and that they don't in.