Summary

Portrait of Thomas Aquinas Thomas Aquinas Summa Theologiae — Question 77 - OF THE ACCIDENTS WHICH REMAIN IN THIS SACRAMENT…

As to the first, matter is the principle of individuation of all inherent forms, because, since these forms, considered in themselves, are naturally in something as in a subject, from the very fact that one of them is received in matter, which is not in another, it follows that neither can the form itself thus existing be in another. As to the second, it must be maintained that the principle of individuation is dimensive quantity. For that something is naturally in another one solely, is due to the fact that that other is undivided in itself, and distinct from all others.
Source: Wikisource

Portrait of Thomas Aquinas Thomas Aquinas Summa Theologiae — Question 77 - OF THE ACCIDENTS WHICH REMAIN IN THIS SACRAMENT…

Since being is not a genus, then being cannot be of itself the essence of either substance or accident. Consequently, the definition of substance is not---"a being of itself without a subject," nor is the definition of accident---"a being in a subject"; but it belongs to the quiddity or essence of substance "to have existence not in a subject"; while it belongs to the quiddity or essence of accident "to have existence in a subject." But in this sacrament it is not in virtue of their essence that accidents are not in a subject, but through the Divine power sustaining them
Source: Wikisource

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