All accidents, whether they be qualities or actions, we necessarily suppose to have some support; and this we call _substance_, deriving the term from the Latin, or _hypostasis_, if we choose to borrow from the Greek.

But what this substance, or hypostasis, is, independently of its qualities or actions, we know not.

This is clearly proved by Locke.

What do we mean by _matter_?
and what by _mind_?
_Matter_ is that which is solid, extended, divisible, movable, and occupies space.
_Mind_ is that which thinks, and wills, and reasons, and remembers, and worships.

Here are qualities in the one case; operations in the other.