It contains the germ of a recurrent philosophical dualism, which differs from pluralism in that it finds two and only two fundamental divisions of being, the physical, material, or potential on the one hand, and the mental, formal, or ideal on the other.
"The Approach to Philosophy"
Ralph Barton Perry
Monism and pluralism now obtain a new meaning.
"The Approach to Philosophy"
Ralph Barton Perry
Thus monism and pluralism are conceptions as proper to cosmology as to ontology.
"The Approach to Philosophy"
Ralph Barton Perry