Dort: this working is supernatural and infallible (article 12)
Thesis XLIII. In the next article the Synod adds that this working of God is wholly supernatural, both most powerful and most gentle, wonderful, hidden and beyond words, and no less in power than creation or the raising of the dead. So all in whose hearts God works in this wonderful way are regenerated surely, infallibly and effectively, and actually believe.
Latin
XLIII. Articulo vero sequenti addit eam Dei operationem esse plane supernaturalem, potentissimam simul & suavissimam, mirabilem, arcanam & ineffabilem, virtute sua nec creatione, nec mortuorum resuscitatione minorem aut inferiorem: adeo ut omnes illi, in quorum cordibus admirando hoc modo Deus operatur, certo, infallibiliter & efficaciter regenerentur, & actu credant.