This paper discusses the fragment DK B6 of Parmenides' poem. The author defends the thesis that the most coherent interpretation of DK B6 were as follows: at the beginning of the fragment the goddess offers the criterion of truthful talking and thinking, and demands from her student to follow it; then, she requires the student to traverse both ways of inquiry, the way of truth and the way of mortals. After that, she exhibits some characteristics of the opinion of the mortals, as well as their crucial mistake; at the end she says that for the mortals there is a backward way, or a way out, which would consist in their return to what was said at the beginning of the fragment, or in their return to the criterion of truthful talking and thinking...