Full Idea
Intellect can abstract mathematical species from sensible matter, both individual and common. Yet it cannot abstract such species from common intelligible matter, but only from individual intelligible matter.
Gist of Idea
Mathematics can be abstracted from sensible matter, and from individual intelligible matter
Source
Thomas Aquinas (Summa Theologicae [1265], Q85 Ad2)
Book Reference
Aquinas,Thomas: 'Treatise on Human Nature (Summa 1a 75-89)', ed/tr. Pasnau,Robert [Hackett 2002], p.160
A Reaction
The idea is that common intelligible matter lacks underlying substance, which is where quantity is to be found.