Taking moral advice on trust
A Socratic walk-through of taking moral advice on trust — reasoned out one step at a time, not lectured.
The question we started with
THE QUESTION #Why do we accept a doctor's word about a diagnosis yet distrust accepting someone's word about whether an act is wrong?
A doctor tells you your thyroid is underactive. You believe it, adjust your life around it, and feel no unease — you did not read the assay, and would not know what to do with it if you had. Now a friend whose judgement you respect tells you that what you did to your sister was wrong. Something resists. Not the content necessarily, but the route: taking it on their word feels like a failure of some kind, in a way that taking the thyroid result on the doctor's word plainly is not.
This is worth separating from a more general worry. Elsewhere in this collection the question was whether testimony can justify belief at all, and the answer there was that it must — you cannot audit your way to a track record for testimony, because the audit runs on testimony. Grant that. The puzzle now is narrower: why should one subject matter feel exempt from an entitlement everything else enjoys?
Reasoning it through
REASONING #The first candidate is simple: there are no moral experts, so there is nobody whose word to take. Test it. Take someone who has thought about the case far longer than you, knows the people involved better, and has no stake in the outcome — or the person your action affected, reporting what it did to her. The informant is plainly better placed than you, and the resistance does not vanish. So the discomfort is not merely a doubt about who qualifies.
Try a second candidate: that moral claims are not the sort of thing anybody can be right about. You cannot use that here, because the resistance shows up in people who firmly believe there are moral truths — often most strongly in them. If the domain were mere preference, deferring would be no odder than deferring about someone's favourite colour, and would not feel like a fault.
So take a third route: perhaps something is missing from the deferring believer even when the belief is true and the source is reliable. Alison Hills has pressed the most influential version of this ("Moral Testimony and Moral Epistemology", Ethics, 2009, recalled). What matters morally, she argues, is not just knowing that an act is wrong but understanding why — and understanding of that kind does not transfer by being told. You can hold the true proposition on my authority and still be unable to say which feature made the act wrong, unable to tell whether a slightly different case falls under the same verdict, unable to act from the reason rather than merely in accordance with it.
Hold that against the doctor. There, understanding is unnecessary: the point of the diagnosis is a true belief supporting a correct action, and nobody thinks you failed as a patient by not grasping thyroid physiology. In the moral case the point is not just the verdict but your relation to it, because a moral judgement is supposed to guide you into cases nobody has ruled on yet. Testimony delivers the verdict and leaves the guidance behind.
There is a stricter version in a Kantian key: an act done because you were told it was right is not done from a recognition of what makes it right, so it may be the correct act while lacking moral worth. That claim is more contested, but it explains why the unease attaches to the agent's character and not only to their evidence.
The analogy
THE ANALOGY #Someone reliable tells you a theorem is true. You now believe something true, on good authority, and you can quote it. What you cannot do is use it: you cannot see which of its conditions are load-bearing, cannot tell whether the variant case in front of you still satisfies them, cannot notice when you have wandered outside its scope.
in mathematics the missing thing can be handed over — you can be shown the proof and then genuinely have it — whereas in ethics two people can be shown every consideration on both sides and still disagree, which is exactly why identifying who understands is so much harder there.
Clarifying the model
THE MODEL #That last sentence is the opening for the other side, and it deserves its full strength. Sarah McGrath has argued that the pessimist's arguments prove too much: parallel reasoning would condemn deference in mathematics, history and empirical science, where we accept it happily, and pessimism sits badly with the plain fact that moral progress often spreads by people taking the word of those who saw it first (recalled). Julia Driver has defended deference on similar grounds. On this view the discomfort is real but misdiagnosed — it tracks the difficulty of picking out a moral expert, not a special barrier in the subject matter.
That diagnosis has a concrete mechanism behind it. The doctor's expertise rests on two supports the moral adviser lacks: outcomes a non-expert can check without sharing the expertise, and an institution that credentials on those outcomes. Moral claims have no comparable outcome test readable from outside. So our reluctance may be a sensible heuristic for a domain where expertise cannot be certified — unglamorous, but adequate.
It does not finish the job, because the thought experiments stipulate a reliable informant and the resistance survives the stipulation. Both explanations are probably doing work, and how much each contributes is live rather than settled.
Two qualifications the debate has forced. First, the asymmetry weakens sharply for fact-laden moral questions — we defer to research-ethics committees and to clinicians on end-of-life practice without discomfort — and is strongest for pure deference to a bare general verdict. Second, a norm of "work it out for yourself" is not innocent. Where the informant is the person harmed, or a group reporting what a practice does to them, they have access you lack, and refusing their word in the name of moral autonomy protects whoever is comfortable. Even pessimists generally allow that you may be required to act on moral testimony while denying you thereby understand or act virtuously — which is where I would leave the dispute standing.
A picture of it
THE PICTURE #How to readThe top requirement breaks into four conditions that acting well on a moral question is supposed to meet. The two boxes at the bottom are sources, and the arrows record which conditions each source can discharge. Read the missing arrows: pure deference reaches the top two and stops, leaving understanding and extension unsatisfied — that gap is the pessimist's whole case. The diagnosis box is there for contrast: nothing above it is missing, because a medical verdict was never required to satisfy the bottom two at all.
What became clearer
WHAT CLEARED #The unease about moral advice is not a doubt about testimony in general, and not scepticism about moral truth. It is that a moral judgement is meant to do more than be true: it is meant to guide you into cases nobody has ruled on, and that requires a grasp of the reason, which the words of a verdict do not carry. Some of the asymmetry, though, is the plain difficulty of identifying who is worth deferring to — and where an informant has access you cannot get, the reluctance stops being a virtue.
Where to go next
ONWARD #- Whether moral understanding can be transmitted by argument and example even if it cannot be transmitted by testimony.
- How aesthetic testimony behaves, since the same reluctance appears there without any of the stakes.
Key terms
TERMS #| Term | What it means |
|---|---|
| Pure moral deference | forming a moral belief solely on someone's say-so, without their reasons. |
| Moral understanding | a grasp of why an act has the moral status it has, as distinct from knowing that it does. |
| Pessimism / optimism about moral testimony | the two families of view on whether pure moral deference is defective. |
| Moral worth | the value an act has in virtue of the motive it was done from, not merely its rightness. |
Every term the collection defines is gathered in the glossary.