Monism is the view that attributes oneness or singleness (Greek:μόνος) to a concept (e.g., existence). Substance monism is the philosophical view that a variety of existing things can be explained in terms of a single reality or substance. Another definition states that all existing things go back to a source that is distinct from them (e.g., in Neoplatonism everything is derived from The One). This is often termed priority monism, and is the view that only one thing is ontologically basic or prior to everything else. Another distinction is the difference between substance and existence monism, or stuff monism and thing monism. Substance monism posits that only one kind of stuff (e.g., matter or mind) exists, although many things may be made out of this stuff. Existence monism posits that, strictly speaking, there exists only a single thing (e.g., the universe), which can only be artificially and arbitrarily divided into many things.

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