 It is possible, of course, that we might think telling the truth is accompanied by the thought doing so will produce some other good (e.g., knowledge or insight) in which case Ross might be right the duty to tell the truth rests on the duty to fulfil a promise. But someone keen on a prima facie duty of veracity might insist even when no good is at stake it might still be prima facie right to tell the truth. It is hard to know what Ross can say to someone who insists on a self-standing prima facie duty of veracity (like Price 1787, 153).