The subtitle of Episode III is the title of Nietzsche's mangum opus "Thus Spake Zarathustra." In Nietzsche book Ecce Homo he said the central idea of Thus Spake Zarathustra is eternal recurrence. Xenosaga Episode III grapples with eternal recurrence. I compare / contrast some Nietzsche quotes with scenes involving eternal recurrence in Episode III.
https://www.youtube.com/watch?v=LGgPrHx849E&t=650s
https://www.youtube.com/watch?v=LGgPrHx849E&t=650s