This difference is subtle, but important.
Public spirituality is the spirituality currently accepted within a society, culture, institution, or tribe. It is the spiritual “state of the union” for a group. In one society, public spirituality might center on religion, scripture, and sacred authority. In another, it might center on nature, meditation, or human flourishing. Public spirituality is not automatically true. It is the spiritual portion of public belief: what a group carries, teaches, practices, tolerates, or treats as normal.
Secular spirituality is spirituality guided by alignment with nature, not the supernatural. It explores many of the same things, but it does not require a church, scripture, deity, afterlife, or hidden realms. It is not anti-religious. It simply says spirituality can stand on common ground in this life and this world.
So public spirituality asks:
“What kinds of spirituality are accepted here?”
Secular spirituality asks:
“Can spirituality be grounded in nature without the supernatural?”
Both can explore metaphysics and ontology: What is reality? What kind of universe are we in? What does it mean that I am here now — aware, temporary, and responsible?
The difference is the role of social acceptance versus reality-alignment. Public spirituality describes what a group currently carries as spiritual belief and practice. Secular spirituality describes spirituality disciplined by this world, this life, and reality as best we can understand it.