Is there one unique set of epistemic desiderata ?

The topic of this paper is epistemology, with particular emphasis on its normative dimension, so it is a piece of meta-epistemology. It expresses a number of concerns about the correct procedure for meta-epistemology and is rather a general form of reflection, than a detailed study. The doubts center on the possibility of non-circular justification of epistemological principles, especially principles dependent on, directed to and expressing some epistemic values.