At Volterra, he wrote a compendium of philosophy and of theology, De institutione christiana and De prima philosophia (Rome, 1518) in which he rather follows Scotus. He translated, from the Greek into Latin, the "Odyssey" of Homer, the "Oeconomics" of Xenophon, the "Gothic War" of Procopius, "Sermones et tractatus S. Basilii", some sermons of St. John of Damascus and of St. Andrew of Crete; he also wrote the "Vita B. Jacobi de Certaldo". While the Spanish humanist Juan Luis Lives mentioned Maffei as an examplar paedogist, Erasmus of Rotterdam criticized his translations of St Basil's works.
