Testard: why particular, efficacious grace is needed
Thesis XXXIX. He admits, though, that unless something more is added, no one can ever be saved by this sufficient grace alone. The reason is man's inborn depravity and wickedness, which keeps him from making good use of the means God sets before him, means otherwise sufficient for salvation in themselves.
So that depravity makes faith and repentance morally impossible for him, although his physical faculties equip him adequately for them. Hence the need for a particular grace to correct man's depravity and so to dispose and move his mind and will from within that, once his corrupt habits are shaken off, he embraces the salvation offered from outside and takes refuge in God's mercy by faith and repentance. This particular grace Testard therefore calls efficacious.
Latin
XXXIX. Agnoscit tamen ille nunquam contingere posse ut, si non aliud accedat, aliquis per solam istam sufficientem gratiam salvetur: idque propter nativam hominis pravitatem atque improbitatem, quae impedit ne bene utatur mediis illis a Deo propositis, & alioquin in se ad salutem sufficientibus. Et sic fidem & resipiscentiam, ad quas homo sufficienter facultatibus Physicis instructus est, moraliter illi impossibilem reddit. Unde emergit necessitas particularis alicujus gratiae, quae pravitatem hominis corrigat, & ita mentem atque voluntatem intus disponat atque afficiat, ut excussis pravis habitibus, salutem extrinsecus oblatam amplectatur, & fide atque resipiscentia ad misericordiam divinam confugiat, quam gratiam particularem ideo vocat efficacem.