 There is a further question of justification to be addressed, for it is one thing to say that persons have a certain valuable quality, but quite another thing to say that there is a moral obligation to respect persons (Hill 1997). So, we must ask: What reasons do we have for believing that the fact that persons possess quality X entails that we are morally obligated to respect persons by, for example, treating them in certain ways? Another way of asking a justification question seeks not a normative connection between qualities of persons and moral obligation, but an explanation for our belief that humans (and perhaps other beings) are owed respect, for example: What in our experience of other humans or in our evolutionary history explains the development and power of this belief? On some accounts, our actual felt experiences of reverential respect play a significant role (Buss 1999b). In other accounts, what justifies accepting our experience of respect for humans (or other beings) as grounds for an obligation is its coherence with our other moral beliefs (Hill 2000b; Margalit 1996; Gibbard 1990).