Being vs. Believing

[Angrboda]

But how do we know what "better than" is if we are only listening to our own voice?

-Do we- only listen to our own voices...regardless of whether we're invoking internal standards or external/imposed standards?  This, like adjusting variables...does not seem to be an issue.

That is the hypothetical. a) Being moral involves believing that we are good rather than being good; b) our standard for when we believe we are being good is internal; c) that standard is loose enough that we can in practice adjust the standard rather than adjusting our behavior. If that all is true, is that not a problem for practical morality?