One Ground, or Many?

The single thing we know for certain is one experiencing: this one, happening now. It does not come labeled as a single universal ground, and it does not forbid many. So the question of whether there is one ground or many is genuinely open, and worth walking carefully, because the pull toward one is strong enough to feel like a proof when it is not.

The pull toward one

Two things pull that way, and both are real.

The first is parsimony. One is simpler than many, and simplicity is a reason to prefer a view, though never on its own a reason to believe it true.

The second is sharper, and old. Call it the interaction argument, associated with F. H. Bradley. Suppose there were several grounds. If they interact at all, then whatever medium lets them interact is a deeper, shared ground, and the real ground is that, so the plurality collapses back to one. And if they do not interact at all, they are causally sealed off from each other, unknowable in principle, and "how many are there" becomes a question no observation could ever answer. So the honest picture is not "one, proven." It is: either effectively one, because any real relation needs a shared ground, or an undecidable plurality of sealed-off grounds that can make no difference to each other. Jonathan Schaffer's modern priority monism sharpens the first horn: what is basic is the whole, the cosmos, and the parts derive from it, rather than the parts being fundamental and the whole assembled.

The pull toward many

The pluralist has a real case too, and it is worth stating rather than waving off. William James, in A Pluralistic Universe, argued that the world is a multiverse and not a universe, that the messy manyness and disconnection we actually experience is the real datum, and that the single tidy Absolute of the monists is an abstraction imposed on it from above. His point lands: we experience many, and "it is really one underneath" is itself an inference, held for reasons, not read off the certainty.

The same question, in religion

This is the fight between one god and many, and the aspect model reframes it usefully. Polytheism can be read two ways. It may describe many dreamers over one canvas: a plurality of creator-minds sharing a single underlying ground. Or it may claim a genuine plurality of grounds. Read the first way, "one god" and "many gods" are not a flat contradiction at all, because one tradition is counting dreamers and the other is counting grounds, and those are different questions. The model does not decide which reading a given tradition intends. It shows that the contradiction is not automatic, and that the metaphysical question and the theological one are the same question wearing two vocabularies.

Held at weight

• That reality is strictly one: not proven.
• That monism is the better bet: yes, on parsimony and the interaction argument.
• That there is an undecidable plurality of sealed-off grounds: a real option, and possibly one no evidence could ever settle.
• That the manyness is fundamental (pluralism): a live minority, kept on the board because the pull toward one is an argument, not a certainty.

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Part of The Open Questions. The tagged version, with the arguments and sources, is in the Library: One or Many.