This passage demonstrates the reciprocity, or complementarity, of memory and mēnis in the context of upholding proper social and cosmic order and the value system based on reciprocal exchange. Elpenor asks Odysseus to remember (μνήσασθαι, O.11.71) him and the funerary rites that are his due so as not to have Elpenor become a mēnima, ‘cause of mēnis’ (O.11.73), of the gods toward Odysseus. If Odysseus remembers and performs the rites, all is well, the cosmic order is maintained; if he forgets, he will incur mēnis as a punishment. Here, too, we can see that memory leads to proper conduct and helps avoid both the wrong courses of action and mēnis; mēnis, in turn, is the punishment when the rules are transgressed, and the fear of mēnis keeps one on the right path. This is central to the complementarity of memory and mēnis and neatly illustrated by the passage: when there is memory, there will be no mēnis, as memory keeps one mindful of the danger of incurring mēnis, and so helps avoid it in the first place. On the contrary, there will only be mēnis when this memory is absent. The relationship between memory and mēnis is thus not of perfectly symmetrical reciprocity, but the provision of one in the absence of the other.
See further:
Watkins, Calvert. 1977. “On Μῆνις.” Indo-European Studies 3:686-722.