Final answer:
The provided excerpts do not reveal Augustine's observations about Ambrose's reading habits, but they do discuss Augustine's theological work and his defense against heresies, as well as his commentary on Apuleius.
Step-by-step explanation:
Augustine, a significant religious figure and theologian, did not directly comment on the reading habits of Ambrose in the provided excerpts. Instead, these excerpts focus on Augustine's address of the intersection of Christian doctrine and classical learning, and his defense of theological perspectives against heresies like Pelagianism and Manichaeism. They also touch upon his efforts against the Donatist controversy, his work 'The City of God', and his observation of Apuleius, another North African author. Despite Augustine's detailed accounts of these themes, there isn't a specific reference to Ambrose's reading habits in the provided texts.