Plutarch closes this part of his essay by describing memory as the storehouse (tamieion) of paideia and remarking that Mne-mosyne has been called the mother of the Muses because nothing but her can gennan kai trephein, make things grow and nourish them. 22 So we see clearly here that the theme of a good that can be stored up and withstand the destructive flow of time is linked with the doctrine that makes the effort of memorization the basis for intellectual discipline. We thus have an image of memory as the inexhaustible granary of wisdom, which defies the onslaught of time and in which the soul may find the food of immortality.
— Jean-Pierre Vernant
Mnemosyne as mother of the Muses is not a quaint genealogical fiction — it is a claim about what makes culture possible at all. What Vernant traces in Plutarch is the moment when memory stops being a natural capacity and becomes a discipline, a storehouse deliberately built against time's erosion. The granary image is worth pressing: grain kept in a tamieion does not grow, it survives. The soul, in this picture, feeds on preserved material rather than on what is living and changing in the present moment.
There is a ratio running beneath this vision of memory-as-immortality-food. If I accumulate enough — enough paideia, enough wisdom, enough rightly-ordered recollection — time will not consume me. The inexhaustible granary defies the onslaught; the soul finds nourishment precisely by refusing to let anything perish. It is a beautiful logic, and like all beautiful logics it organizes itself around the thing it most fears. What the granary cannot hold is what refuses preservation: the grief that has not been fully felt, the image that keeps shifting, the dream that dissolves on waking. Mnemosyne nourishes what can be stored. The psyche's living speech tends to arrive in exactly what storage ruins.
Jean-Pierre Vernant·Myth and Thought Among the Greeks·1983