..kindly provided by GALHA (can't easily reference source):
"Nietzsche urged us to “remain true to the Earth, and believe not those who advise a hope above the world.” In this worldliness lies the key to secular spirituality. The sacred and the spiritual are to be found in the virtues, values, and creative capacities within each and every one of us, right here on Earth.
For too long, we have accepted a false dichotomy between that which is mundane, earthly, and human, and that which is high, heavenly, and divine. The sacred has always been exiled to another world or dimension. But we exist here and now, in a specific space and time, and not in some eternal, otherworldly, Platonic realm. As philosopher Benedetto Croce put it, “Eternity is in the moment for those who know how to place it there.”
Properly understood, then, the spiritual is that which pertains to our human capacities for understanding, self-awareness, free will, and moral responsibility. And the sense of the sacred comes from realizing our own potential and striving for the best within us."