They are chosen then before the foundation of the world, according to that predestination by which God foreknew His future acts. They are chosen out of the world by that call whereby God fulfills what He has predestined: whom He did predestinate, them He also called. (Rom. 8:30)
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).
Also cites: de Prad. Sanct. c. xvii.