Cap. 6 Arg. 8 Secundo: Augustine—who are made sheep; no decree to give all the grace that makes believers
Augustine's second witness is Against Two Letters of the Pelagians 4.6: the One who makes people sheep is the One who frees human wills for the obedience of piety. Why he makes these sheep and not those—that is the question that belongs to the depth the Apostle feared to look into and cried, O the depth. Making sheep or not making them means nothing but making people faithful and obedient—or not. Both acts are God's, and both run by the purpose of his hidden will. So Christ's death did not fix the decree some invent: that the grace which makes believers and the obedient is prepared, offered, and given to everyone, on condition that free choice embrace it.
Latin
Secundum testimonium Augustini habetur lib. 4. contra duas Epist. Pelag. cap. 6: Qui facit oves homines, ipse ad obedientiam pietatis humanas liberat voluntates. Sed quare istos homines oves facit, et istos non facit, ipsa est quaestio quae ad illam pertinet altitudinem, quam perspicere volens Apostolus expavit, et exclamavit, O altitudo. Hisce in verbis per facere oves, et non facere, nil aliud significatur, quam facere fideles et obedientes, et non facere. Utrumque Deo tribuitur, idque secundum propositum arcanae suae voluntatis. Christi ergo morte non est stabilitum tale decretum, quale nonnulli finxerunt, de praeparanda, offerenda et donanda omnibus hominibus ea gratia qua credentes et obedientes reddantur, sub conditione liberi arbitrii eandem amplexantis.