Cap. X Ultimum Propos. 1.III: grace that only warns and persuades, leaving the will under free will’s dice, is law not proper grace — Aug. De grat. Christi 13–14
But of the grace that only warns and persuades, and leaves the will under free will’s uncertain dice, Augustine holds it looks to law rather than to grace properly so called (De gratia Christi contra Pelagium 13): Who knows what ought to be done and does not, has not yet learned from God according to grace, but according to law. And at the start of 14: Who has not come is not yet rightly said to have learned—he heard and learned that he ought to come, but will not do what he learned. That mode of teaching is not rightly called the way God teaches by grace.
Latin
De illa autem gratia quae monet et suadet tantum, sed ipsam Voluntatem quasi sub alea incerta liberi sui arbitrii relinquit, sentit Augustinus, ad legem potius eam spectare quam ad gratiam proprie dictam: Qui novit quid fieri debeat, et non facit, nondum a Deo didicit secundum gratiam, sed secundum legem, De gratia Christi, contra Pelag. cap. 13. Et initio cap. 14. Qui non venit, nondum ille recte dicitur didicisse: audivit quidem et didicit oportere veniendum, sed facere non vult quod didicit. Prorsus non recte dicitur de isto docendi modo, quo per gratiam docet Deus.