Cap. 6 Arg. 8 Secundo: Augustine—faith is God's gift; birth-guilt already justifies withholding it
Third witness: On the Predestination of the Saints 8. Faith begun and faith perfected is God's gift. No one who will not fight the plainest Scripture should doubt that this gift is given to some and not to others. Why not to all should not unsettle the believer who holds that from one man all went into condemnation. Augustine teaches outright that the grace of faith is not given to all; we need no further reason for the gift withheld, because the damnable state in which we are all born already upholds God's justice—even if he gave saving grace to no mortal at all.
Latin
Tertium testimonium depromitur ex De Praed. Sanctor. cap. 8: Fides inchoata et perfecta donum Dei est. Et hoc donum quibusdam dari, quibusdam non dari, omnino non dubitet, qui non vult manifestissimis sacris literis repugnare. Cur autem non omnibus detur, fidelem movere non debet, qui credit ex una omnes isse in condemnationem. Clare docet gratiam fidei non dari omnibus; nec opus esse ut aliquam aliam rationem non-datae hujus gratiae quaeramus, quia damnabilis iste status, in quo omnes nascimur, sufficit ad justitiam Dei asserendam, etiamsi nemini mortalium daret gratiam salvantem.