This paper explores the coexistence of more apologetic and of more systematic considerations in the _Āpta-mīmāṁsā_ (ĀMī), _Investigation on authority_, of the Jain author Samantabhadra (530–590). First, this treatise offers a relevant case study to investigate the transition from a conception in which the reliability criterion of an authoritative discourse is the authoritative character of its utterer, to a conception in which the criteria of validity and soundness of the discourse itself are foremost. Second, Samantabhadra is one of the first (...) authors to undertake to logically prove the omniscience of the Jain teachers. And third, he links these questions to the celebrated Jain epistemological theory of non-one-sidedness. (shrink)