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Full Idea
It is proper to substance both to stretch out or exist beneath accidents, which is to substand, and to exist per se and not in another, which is to subsist.
Gist of Idea
Substances 'substand' (beneath accidents), or 'subsist' (independently)
Source
Eustachius a Sancto Paulo (Summa [1609], I.1.3b.1.2), quoted by Robert Pasnau - Metaphysical Themes 1274-1671 06.2
Book Ref
Pasnau,Robert: 'Metaphysical Themes 1274-1671' [OUP 2011], p.103
A Reaction
This reflects Aristotle wavering between 'ousia' being the whole of a thing, or the substrate of a thing. In current discussion, 'substance' still wavers between a thing which 'is' a substance, and substance being the essence.