Quite a challenge . . .

[Nietzsche's] idea of eternal recurrence cannot be grasped fully if it is shrugged off as cosmological or metaphysical speculation. Nietzsche certainly believed in its propositional truth, but regarded the existentially transformed power that emanated from this idea as still more significant. He understood it as a challenge to live every moment in such a way that it could return without causing horror.

Rudiger Safranski Nietzsche
(W.W. Norton & Co., Dec. 2001)