All the main branches of philosophy today were once a part of Medieval philosophy. Medieval philosophy also included most of the areas originally established by the pagan philosophers of antiquity, in particular Aristotle. However, the discipline now called
Philosophy of religion was, it is presumed, a unique development of the Medieval era, and many of the problems that define the subject first took shape in the Middle Ages, in forms that are still recognisable today.
Theology Medieval philosophy is characteristically theological. Subjects discussed in this period include: • The problem of the compatibility of the divine attributes: How are the attributes traditionally ascribed to the Supreme Being, such as unlimited power, knowledge of all things, infinite goodness, existence outside time, immateriality, and so on, logically consistent with one another? • The
problem of evil: The classical philosophers had speculated on the nature of evil, but the problem of how an all-powerful, all-knowing, loving God could create a system of things in which evil exists first arose in the medieval period. • The
problem of free will: A similar problem was to explain how 'divine foreknowledge' – God's knowledge of what will happen in the future – is compatible with our belief in our own
free will. • Questions regarding the immortality of the intellect, the unity or non-unity between the soul and the intellect, and the consequent intellectual basis for believing in the immortality of the soul. • The question of whether there can be substances which are non-material, for example, angels.
Metaphysics of the Metaphysics:
Ens dicitur multipliciter – the word 'being' is predicated in many ways After the 'rediscovery' of Aristotle's
Metaphysics in the mid-twelfth century, many scholastics wrote commentaries on this work (in particular
Aquinas and
Scotus). The
problem of universals was one of the main problems engaged during that period. Other subjects included: •
Hylomorphism – development of the Aristotelian doctrine that individual things are a compound of material and form (the statue is a compound of granite, and the form sculpted into it) •
Existence – being qua being •
Causality – Discussion of causality consisted mostly of commentaries on Aristotle, mainly the
Physics,
On the Heavens,
On Generation and Corruption. The approach to this subject area was uniquely medieval, the rational investigation of the universe being viewed as a way of approaching God. Duns Scotus' proof of the existence of God is based on the notion of causality. •
Individuation. The problem of individuation is to explain how we individuate or numerically distinguish the members of any kind for which it is given. The problem arose when it was required to explain how individual
angels of the same species differ from one another. Angels are immaterial, and their numerical difference cannot be explained by the different matter they are made of. The main contributors to this discussion were
Aquinas and
Scotus.
Natural philosophy In
natural philosophy and the
philosophy of science, medieval philosophers were mainly influenced by Aristotle. However, from the fourteenth century onward, the increasing use of mathematical reasoning in natural philosophy prepared the way for the rise of science in the
early modern period. The more mathematical reasoning techniques of William Heytesbury and William of Ockham are indicative of this trend. Other contributors to natural philosophy are
Albert of Saxony,
John Buridan, and
Nicholas of Autrecourt.
Logic The historian of logic
I. M. Bochenski regarded the Middle Ages as one of the three great periods in the
history of logic. From the time of
Abelard until the middle of the fourteenth century, scholastic writers refined and developed
Aristotelian logic to a remarkable degree. In the earlier period, writers such as
Peter Abelard wrote commentaries on the works of the
Old logic (Aristotle's
Categories,
On interpretation, and the
Isagoge of
Porphyry). Later, new departments of logical enquiry arose, and new logical and semantic notions were developed. For logical developments in the Middle Ages, see the articles on
insolubilia,
obligations,
properties of terms,
syllogism, and
sophismata. Other great contributors to medieval logic include
Albert of Saxony,
John Buridan,
John Wyclif,
Paul of Venice,
Peter of Spain,
Richard Kilvington,
Walter Burley,
William Heytesbury, and
William of Ockham.
Philosophy of mind Medieval philosophy of mind is based on Aristotle's
De Anima, another work discovered in the Latin West in the twelfth century. It was regarded as a branch of the philosophy of nature. Some of the topics discussed in this area include: •
Divine illumination – The doctrine of Divine illumination was an alternative to
naturalism. It holds that humans need a special assistance from God in their ordinary thinking. The doctrine is most closely associated with
Augustine and his scholastic followers. It reappeared in a different form in the
early modern era. • theories of demonstration • mental representation – The idea that mental states have 'intentionality'; i.e.,
despite being a state of the mind, they are able to represent things outside the mind is intrinsic to the modern philosophy of mind. It has its origins in medieval philosophy. (The word 'intentionality' was revived by
Franz Brentano, who was intending to reflect medieval usage). Ockham is well known for his theory that language signifies mental states primarily by convention, real things secondarily, whereas the corresponding mental states signify real things of themselves and necessarily. Writers in this area include
Saint Augustine,
Duns Scotus,
Nicholas of Autrecourt,
Thomas Aquinas, and
William of Ockham.
Ethics Abu Nasr al-Farabi:
Abu Nasr al-Farabi is well known in the world of medieval Islamic philosophy and ethics for his distinct approach to writing. Deviating from the traditional path of philosophical documentation, al-Farabi wrote in a simplistic manner. There is little immediate intricacy to be observed in his work. In addition to this, al-Farabi wrote in a narrative style. As opposed to listing theories, he told a story with subtle and implicit themes of original ethical concepts. Contributions: In his narrative pieces, al-Farabi discussed ethical and philosophical theories with reference to politics, leadership, morals, faith, and civics. Notable works of his include The Attainment of Happiness, in which al-Farabi reasons that conceptions of political science and religion must be built on a foundational understanding of the universe. He advocates that one must first construct notions in relation to universal matters to form just opinions in regard to political philosophy and religion. These two subjects are significant focal points in his work. Much of his writing is deliberated on his perceived conceptions of the juxtaposition and interaction of the aforementioned topics such as his claim that both political and religious figures rest in the same classification as adjacent to a fundamental comprehension of the universe. Writers in this area include
Anselm,
Augustine,
Peter Abelard,
Scotus,
Peter of Spain,
Aquinas, and
Ockham. Writers on political theory include
Dante,
John Wyclif, and
William of Ockham. == See also ==