Senses of 'being able' (1): remotely, through free choice
Thesis XI. They readily grant, however, that even without Christ's efficacious grace people can be said in many ways to be able to keep God's commandments and do good works. Jansenius sets this out at length in De gratia Christi Salvatoris, book 3, chapter 15. There he notes that, in matters of the good or devout life, a person can be said to be 'able' to do something in several senses.
The first and most remote is through the mere capacity of free choice to be turned toward good or toward evil. This power is grounded in the bare nature of free choice, so long as it has not yet been hardened in evildoing by the penalty of eternal damnation. Only demons and the damned, then, should be said in this sense to be no longer able to believe, love and do good, since they are no longer in a state where God's grace could bend them toward the good. Conversely, every human being without exception, for as long as he lives this mortal life on earth, is rightly said in this way to be able to believe and to love God, because through God's grace he can be bent toward these things.
Latin
XI. Caeterum ultro agnoscunt & fatentur, verum esse quod homines, etiam absente Christi gratia efficaci, dici possint multis modis posse Dei praecepta servare, & facere bona opera. Id prolixe videre est apud Jansenium Episcopum Iprensem, de Gratia Christi salvatoris libro tertio cap. 15. Ubi observat in rebus ad vitam bonam seu pietatem spectantibus, multipliciter hominem dici posse aliquid. Primo remotissime, per solam liberi arbitrii flexibilem facultatem ad bonum & ad malum. Quae potestas in natura nuda liberi arbitrii constituta est, quamdiu nondum ad malefaciendum per supplicium aeternae damnationis obduruit. Adeoque soli daemones & damnati hoc sensu dici debent non amplius posse credere, diligere, & benefacere; quia non sunt in eo statu ut ad bonum per Dei gratiam flecti possint. Et e contrario omnes prorsus homines quamdiu mortalem hanc vitam in terris degunt, recte dicuntur ea ratione posse credere & Deum diligere, quia sunt per Dei gratiam ad ista flexibiles.