Where Thomists and Jansenius agree on efficacious grace
Thesis LXXIII. On efficacious grace, the Thomists teach together with Jansenius that no grace of Christ exists that is not efficacious in some respect: there is none that fails to bring about, surely and infallibly, some effect, the very effect for which God precisely gives it and to which his absolute decree has destined it. Jansenius, for his part, grants with them that Christ's grace determines the will physically as well as morally.
With one accord and equal insistence both sides maintain that divine grace is efficacious from itself and of itself. Its efficacy is absolute and does not hang on the consent of free choice, and grace is master over free choice rather than subject to its power.
Latin
LXXIII. Quod attinet autem gratiam efficacem, Thomistae cum Jansenio docent nullam esse Christi gratiam quae ratione quadam efficax non sit, hoc est, quae non producat certo & infallibiliter effectum aliquem, ad quem efficiendum praecise a Deo data est, & absoluto Dei decreto destinata. Jansenius vero cum illis agnoscit gratiam Christi, non moraliter tantum, sed etiam physice voluntatem determinare. Ac communi consensu, & pari contentione, pertendunt utrique gratiam divinam ex se & per se efficacem esse: ejus efficaciam a consensu liberi arbitrii non pendere, sed esse absolutam: & gratiam libero arbitrio dominari, non vero potestati illius subjacere.