Full Idea
The primary qualities of tangible things are the cause of all the other sensible qualities.
Gist of Idea
Primary qualities are the cause of all the other sensible qualities
Source
Albertus Magnus (On 'Generation and Corruption' [1261], II.1.1), quoted by Robert Pasnau - Metaphysical Themes 1274-1671 21.2
Book Reference
Pasnau,Robert: 'Metaphysical Themes 1274-1671' [OUP 2011], p.462
A Reaction
This makes the primary qualities sound suspiciously like the essence.