Thesis XXXVIII. He calls that grace sufficient because it gives a person the ability to be saved if he wills. So if someone does not come to share in salvation, the cause lies only in his own depravity and malice, and he cannot complain of God as though God had denied him something without which he simply could not be saved.
For he has the object set before him in sufficient light, and he has a mind and will that of themselves can and should embrace and accept it. Only his own perversity, of which he himself is the cause, prevents this, and for that reason he has no ground to complain of God.
Latin
XXXVIII. Gratiam autem illam dicit esse sufficientem, quoniam dat homini posse servari si velit: adeo ut si homo salutis particeps non fiat, stet tantum penes ejus pravitatem & malignitatem, neque de Deo queri possit, quasi aliquid ipsi denegaverit, sine quo absolute non possit esse salvus: cum habeat objectum in sufficienti lumine propositum, & mentem & voluntatem, quae per se possint & debeant illud amplecti atque suscipere: ac quominus id fiat, obstet sola ejus perversitas, cujus ipse causa est, ac propter quam nullam habet rationem de Deo querendi.