Molina need not reconcile efficacy with freedom: grace is subject to choice
Thesis LXXXIV. Plainly, then, Molina has no need to labour at reconciling the efficacy of divine grace with the freedom of human choice. He makes God's grace subject to man's free choice, and will not allow any aid of grace to be so efficacious that it determines free choice to act of itself.
Whatever aid from God is supposed to precede a good action, the human will's dissent can always coexist with it, and it remains in a person's power to use it as he pleases or not to use it.
Latin
LXXXIV. Hinc patet nullo modo Molinae laborandum esse, ut efficaciam gratiae divinae cum arbitrii humani libertate conciliet. Siquidem Dei gratiam libero hominis arbitrio subjicit; nec vult ullum ejus auxilium esse tantae efficacitatis, ut liberum arbitrium ad agendum ex se determinet; sed qualecunque Dei auxilium ad bonam actionem praevium supponatur, cum eo semper stare posse voluntatis humanae dissensum, & in hominis potestate manere illo pro libitu uti, vel non uti.