A question to the hylomorphic; how can it be said that being’s are a matter form composite? If matter, as Aristotle defined it and not the physicist, is most fundementally a pure potentiality substance which, when mapped unto a form, is transformed into actuality, then how can it be said that matter is pure potentiality?
Matter is said to be pure potentiality because in itself it is only a potential being and entirely formless. Forms are the act of matter so that matter actually exists only through the form. Actually existent matter is not transformed into a form but remains what it is, namely, prime matter and it only actually exists through the form. Forms are acts and matter is potency so a form/matter composite is also a composite of act/potency.
For to be in potentiality to a given thing is to not have said thing but hold the possibility of attaining such thing. But if existence is something that matter holds by nature, as matter, I believe, is according to Aristotle the underlying substance which denotes something as existing, then matter is in a state of actuality to at minimum one thing; existence. How can we thus call it pure potentiality? It would make more sense to call nonbeing pure potentiality, as it truly is devoid of all attributes and qualities while simultaneously “holding” (I use the phrase analogically) the possibility of future actualization.
The nature of matter is potential being not actual being which is through the form. It is only by being informed that matter actually exists but which really is a being or substance is the composite of form/matter because neither the form or matter exists by itself except in the case of the human soul which can subsist without the body.
Further, on the subject of form; how may it be said that form is that which actualizes potentiality if form is itself not in any state of actuality?
Forms are called acts so they are actual and things are what they are or the kind of thing they are through their form.
We can know this, I presume, from the knowledge that forms are incomplete, in so far as they do not hold existence - the foundation of being - unless they are made actual by matter.
Forms are not made actual by matter which is only potentiality. Rather, forms are the act of matter.
For example, before the construction of chairs there was the “pre-existing” (I use the word analogically) form of chairs; this form was not, however, present in any given matter, and thus not within being.
The form of chair pre-exists in that which it is made out of such as wood. It pre-exists potentially in the matter or substance of the wood, not actually until the chair is made.
As such, it would seem as if the matter is the actualizer whilst the form is the potentiality being actualized.
The actualizer of the chair is the efficient cause of the chair, namely, a human being who formed the wood into a chair. The wood of the chair remains what it was before, namely, wood. The chair is an accidental form of wood which is a composite substance of form/matter.