The concept of "heresy" in Patočka's late texts is ambiguous and open to many interpretations. It could perhaps be explained in the context of phenomenology itself as a sort of drifting away from the original, Husserlian foundations towards a dynamic understanding of intentionality as including "operative concepts," i.e., shadows, blind spots, irreducible non-evidences, in its complex dynamics. This then highlights the phenomenological mode of thinking as a development of the critical attitude (qua care for the soul). Heresy means going beyond the limits of phenomenology as an act of fidelity and adherence to it.