Jerome, Letter 152 (to Riparius)
Nor am I moved by their writings, which I do not know, since I know that the will indeed of blasphemy is most wicked, but that they have not the strength of prudence and eloquence — especially also [not] the knowledge of the Holy Scriptures, which are the foundation of the faith, and the law of the ecclesiastical forum, and the authority of the ancestors.
Nec eorum scriptis, quae ignoro, moueor, cum sciam uoluntatem quidem blasphemiae pessimam, sed uires prudentiae et eloquentiae non habere praecipueque sanctarum scripturarum notitiam, quae sunt fidei firmamentum et ius ecclesiastici fori auctoritasque maiorum.
Riparius was a priest to whom Jerome annually wrote, although only four of the letters survive (per Andrew Cain).
Latin from CSEL 56 (p. 365)
