The Form of the F, as cause of F-ness in numerically distinct particulars A and B, must ground numerically distinct instances of F-ness, introducing real internal differentiation into the Form itself.

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F-ness(as used in logic and philosophy of properties): A shorthand way of saying 'the quality of being F'—so if F stands for 'red,' then F-ness means 'redness,' the actual quality or property itself.
Form (or Idea)(as the central concept in Plato's metaphysics): In Plato's philosophy, a perfect, eternal, unchanging template or blueprint that exists beyond the physical world—for example, the Form of Beauty is the perfect ideal that all beautiful things in the world imperfectly copy.
Ground (or grounding)(explaining what provides the basis for requirements): To serve as the foundation or reason for something; to explain why something is true or obligatory.
Internal differentiation(as a property being discussed about God's nature): The quality of having distinct, separate parts or differences within something; in this case, whether God has different qualities or aspects within God's being.

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