"What is due to each one, what God refuses to nobody, is sufficient grace for salvation, which makes it really possible to keep the commandments, for God never commands what is impossible. As for efficacious grace, especially the grace of final perserverance, this He grants by reason of His mercy. But of the adults, only those are deprived of it who through their own fault refuse to accept it. The doctors of the Church often pointed this out in the comparison they drew between the death of the good thief and that of Judas who resisted the final appeal of grace."
-Fr. Reginald Garrigou-Lagrange from his book Predestination.