Peter Alphonsi (A.D. 1062-1110) [P.81] was a Spaniard converted Jew who became a Christian at age 44. In his Dialogue with the Jew Moses, he ridicules the Talmud and mounts a rigorous attack against Islam.
Rupert of Deutz (A.D. 1075-1129) [P.81] writes in his Dialogue between a Christian and a Jew, an apologetic that focuses primarily on the miracles of Scripture.
Peter the Venerable (A.D. 1094-1156) [Pp.81-82] is the most eminent 12th century apologist and the last great abbot of Cluny. In his Against the Inveterate Obstinacy of the Jews, he aims at converting Jews by demonstrating that the divine Messiah, his humiliations, and his establishment of a spiritual kingdom are grounded in the Israelite prophets. In his treatise A Book Against the Sect or Heresy of the Saracens, he addresses the Moslems through; reason, not hatred, by words, not force, not in hatred, but in love. He appeals to them from the Koran and affirms that; their book commands them to look to the Christian Bible as divinely authoritative and it is this Bible which points to Jesus rather than Mohammed as the true teacher. Hence, in following the Bible one is to reject Mohammed.
Peter of Blois (D. 1202) in his Against the Perfidy of the Jews, he warns Christians of the diabolical tactics by which the Jews evade the evidences. He also used arguments from the Incarnation, virginal birth, Passion, and Resurrection of Christ in his apologetic.
Peter Abelard (A.D. 1079-1142) [Pp.82-84] gave considerable clout to reason in the area of religious conviction. He maintained that human reason (unlike the Augustinians), making use of objectively accessible evidences, could achieve some kind of initial faith. For Abelard, the “blind faith” of Abraham is an exceptional grace, and thus not normative for ordinary Christians.
In his A Dialogue between a Philosopher, a Jew, and a Christian, Abelard discusses the rational grounds for faith and highlights the moral superiority of Christianity, with its’ ethics of charity over every religion including Judaism.
In his Christian Theology, Abelard deals with the divine Logos doctrine, and tackles the Trinitarian implications of the Neo-Platonic doctrine of divine emanations. Abelard’s enthusiasm to build bridges from Christian orthodoxy to alien religions and philosophies, coupled with his attempt to close the gaps between faith and reason, brought on opposition by Bernard of Clairvoux who distrusted dialectics. This tension between Abelard and Clairvoux symbolize the struggle of every generation.
Richard of St. Victor (1155) [Pp.84-85] wrote a treatise On the Trinity where he combines the traditional insistence on external signs of revelation with a serious quest for necessary reasons. He also justifies his initial faith by appealing to the extrinsic evidence of miracles.
Alan of Lillie (D. 1202) [p.85] convinced that Moslems could not be won over through arguments from the Scriptures, vied for using intrinsic arguments for the truth of various Christian doctrines. In On the Catholic Faith against Heretics of His Time, Alan sought to demonstrate Christianity’s faith by using a few simple truth maxims. In The Art of the Catholic Faith, Alan (supposedly authored) directs his arguments specifically against Moslem tenets.
THOMAS AQUINAS (A.D. 1225-74) [Pp.85-94]
Augustine’s spiritual theology was declining, while Aristotelian philosophy was coming to the forefront of popular thought. For the first time since the Patristic era, Christians were being offered a scientific vision of the universe that depended not on the Bible. Through the Spanish Arabic philosopher Averroes (A.D. 1126-98) the teachings of Aristotle became available and the penetration of Averroes precipitated a major spiritual crisis in the European universities.
Combating Aristotelianism could be realized by simply erecting Christian Aristotelianism. Thomas wrote a series of philosophical commentaries on Aristotle. On certain points he conceded with Aristotle. However, Christian revelation had corrected and completed Aristotle’s deficiencies.
In his Summa Contra Gentiles, (either authored in 1258-1264 or 1270-1272), a work understood by many as addressing Christian missions and the university scholar. This word has no equal in its field. The aim of the Summa is to be an apologetical theology confronting the new challenge of the scientific Greco-Arabic worldview. Among other things, the work deals with: First Book: Chapters 1-9 deals with all things that make one a wise man in light of the supreme truth (first principles) from which all reality derives.
The theologian who contemplates reality in light of divine wisdom has the task of refuting errors in religious teaching, as well as making known the truth of the Catholic Faith and confuting her opponents.
He understands that if the scriptures are not taken to be authoritative, it is appropriate to argue from reason rather than authority. This does not mean that Aquinas viewed reason as limitless, but he understood that the human mind could discover the divine. For him, some truths of God are revealed in nature, whereas other truths can only be known through revelation (i.e., Trinity, Incarnation, Sacraments, resurrection). Aquinas sees that the chief end of man is to find his felicity in the contemplation of God.
The following are some of His Apologetic Arguments: [Pp.91-92]
Miracles were a sign of being God’s messenger, which are stressed in the prophetic writings. Aquinas defines a miracle strictly as a work that only God could perform. Moreover, he argues from the impact of Christianity in the world as a proof of its veracity and he indicts Mohammed’s testimony as that which seduced people with carnal pleasures; it taught no sublime truths but those which are common to man; the Koran is mixed with fables and errors and those who trust Mohammed’s words believe lightly.
Augustine and Aquinas’ Differences: [P.92] His Summa Contra Gentiles is a masterpiece and is considered in the Middle Ages as a work comparable to Augustine’s City of God, of the Patristic era. Thomas used Aristotelian philosophy, whereas Augustine used Neoplatonic philosophy. Thomas argues from a metaphysical angle, whereas Augustine argues through interpreting history. Thomas uses dispassionate reasoning in his persuasion, whereas Augustine uses rhetoric as his persuasion.
Concluding Remarks: In his Summa contra Gentiles towers above all previous apologetic works in its clarity, perfect coherence, balance, economy, and precision. Aquinas like Augustine responded to the challenges hoisted against Christendom with the tools they had a developed.