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knowledge is predicated of the subject in whom the knowledge exists; space is the limit of something, time the measure of something. Fire, on the other hand, is predicated of nothing; wood as such is predicated of nothing; and so with man, Socrates, and the composite substance in general.

Equally the Substantial Form is never a predicate, since it never acts as a modification of anything. Form is not an attribute of Matter (hence, is not predicable of Matter); it is simply a constituent of the Couplement. On the other hand, the Form of a man is not different from the man himself (and so does not "modify" the Couplement).

Matter, similarly, is part of a whole, and belongs to something else only as to a whole and not as to a separate thing of which it is predicated. White, on the contrary, essentially belongs to something distinct from itself.

We conclude that nothing belonging to something else and predicated of it can be Substance. Substance is that which belongs essentially to itself, or, in so far as it is a part of the differentiated object, serves only to complete the Composite. Each or either part of the Composite belongs to itself, and is only affirmed of the Composite in a special sense: only qua part of the whole is it predicated of something else; qua individual it is never in its essential nature predicated of an external.

It may be claimed as a common element in Matter, Form and the Couplement that they are all substrates. But the mode in which Matter is the substrate of Form is different from that in which Form and the Couplement are substrates of their modifications.

And is it strictly true to say that Matter is the substrate of Form? Form is rather the completion which Matter's nature as pure potentiality demands.

Moreover, Form cannot be said to reside in Matter (as in a substrate). When one thing combines with another to form a unity, the one does not reside in the other; both alike are substrates of a third: thus, Man (the Form) and a man (the Composite) are substrates of their experiences, and are prior to their activities and consequents.

Substance, then, is that from which all other things proceed and to