The older scholastics: operating grace as the habit of grace
Thesis XLIII. The theologians of the Roman Church, however, do not agree on which grace it is that works without us, or which grace cooperates with us, or how and how far we cooperate with it.
The older scholastics, according to Bellarmine, give the name operating grace to the habit of grace itself, insofar as it formally makes us righteous and pleasing to God, since God does this in us without us. They take cooperating grace to be the same habit insofar as it is the source of meritorious works: when we do good works, grace is not the only thing at work in us, but we ourselves also truly cooperate.
Latin
XLIII. Sed non convenit inter Theologos Ecclesiae Romanae, quae sit illa gratia quae sine nobis operatur: & etiam quae sit illa quae nobis cooperatur, & quomodo, & quatenus illi cooperemur. Vetustiores Scholastici, testante Bellarmino, gratiam Operantem vocant ipsum habitum gratiae, ut formaliter nos justos & gratos Deo reddit, Id enim Deus in nobis, sine nobis facit. Gratiam cooperantem esse volunt eundem habitum, ut operis meritorii principium est. Quum enim bona opera facimus, non sola gratia operatur in nobis: sed & nos ipsi vere cooperamur.