Note on form

Form = what a thing has that makes it impossible to be something else*.

Matter = what a thing has that makes it possible for it to be something else.

Change requires both. Assuming there is some unchangeable substance, by definition it is non-material form.

Why call the thing that can be otherwise matter? Because something is more fundamentally matter to the extent that it survives more and more changes. Things are more elemental to the extent that they are maximally present before and after changes.


*The “Something else” is either another accident or another substance.

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