 One way moral truths can be revealed per accidens is when someone relies on an authority for a moral claim that they in some sense could have thought out for themselves, but didn’t. Anscombe does not imply that so relying need be a sign of laziness; rather, she thinks that different people have already grasped different parts of the moral law (AIM, 45), and so seems to think that sharing moral truths is much like sharing other truths. For example, if you tell me what you ate for lunch, I can reasonably trust you even if in principle it’s true that I could have instead spied on you to find out. Likewise, I might reasonably believe you when you tell me some moral truth that I hadn’t worked out for myself (but, in theory, could).