Roman doctors differ on how grace is efficacious, but all agree it leaves the power to refuse
The doctors of the Roman School differ widely among themselves on how divine grace is efficacious. Some hold that grace not only gives free choice new strength, invites and urges man to do good, or even helps him in doing it, which all grant, but also that its efficacy is so great that it bends and determines the will to do good infallibly and irresistibly. Others deny this, as we have shown more fully elsewhere.
But all agree that, however great the efficacy of divine grace, it still does not take from free choice the power to reject the good to which it moves and draws a man.
So even those who maintain that grace is efficacious of itself and works the act of conversion in man infallibly still admit, in line with the canon of Trent, that man always keeps the power to dissent from grace and resist it. Thus all agree that free choice, once grace has gone before it and roused it, can do good in such a way that the contrary remains within its power.
Latin
V. Porro Scholae Romanae Doctores circa modum quo gratia divina efficax est, multum inter se dissentiunt: dum alii volunt gratiam libero arbitrio non solum novas vires tribuere, hominemque ad bene agendum invitare & sollicitare, aut etiam in bene agendo adjuvare quod omnes concedunt; sed etiam tantam ejus esse efficaciam, ut voluntatem ad bene agendum flectat & determinet infallibiliter & insuperabiliter: alii vero istud negant, ut pluribus alias a nobis ostensum est. Caeterum omnes in eo conveniunt, quantacunque sit gratiae divinae efficacia, illam nihilominus a libero arbitrio non tollere potestatem repudiandi bonum ad quod hominem movet atque allicit. Adeoque illi ipsi qui pertendunt gratiam per se efficacem esse, & conversionis actum infallibiliter in homine operari, conformiter tamen Canoni Tridentino fatentur semper in homine manere potestatem a gratia dissentiendi, & illi resistendi. Ac proinde omnes in eo consentiunt liberum arbitrium per gratiam praeventum & excitatum, sic posse bene operari, ut contrarium in ejus facultate maneat.