Logic and epistemology -- Philosophy, theology, logic, and the sciences -- Augustine on ancient philosophy -- Dialectica Monaccensis (anonymous, twelfth century) on the division of science -- Thomas Aquinas on the nature and scope of sacred doctrine -- The problem of universals -- Boethius against real universals -- John of Salisbury on the controversy over universals -- The Summa Lamberti on the properties of terms -- William Ockham on universals -- John Buridan on the predicables -- Illumination vs. abstraction, and scientific knowledge -- Augustine on divine ideas and illumination -- Thomas Aquinas on illumination vs. abstraction -- Thomas Aquinas on our knowledge of the first principles of demonstration -- Henry of Ghent on divine illumination -- Duns Scotus on divine illumination -- Knowledge and skepticism -- Augustine on the certainty of self-knowledge -- Thomas Aquinas on whether the intellect can be false -- Henry of Ghent on whether a human being can know anything -- Nicholas of Autrecourt on skepticism about substance and causality -- John Buridan on scientific knowledge -- Philosophy of nature, philosophy of the soul, metaphysics -- Hylomorphism, causality, natural philosophy -- Thomas Aquinas on the principles of nature -- Thomas Aquinas on the mixture of elements -- Giles of Rome on the errors of philosophers -- Selections from the condemnation of 1277 -- John Buridan on the impetus theory of projectile motion -- Human nature and the philosophy of the soul -- Augustine on the soul -- Averroees on the immateriality of the intellect -- Siger of Brabant on the intellective soul -- Thomas Aquinas on the nature and powers of the human soul -- John Buridan on the immateriality of the soul -- Metaphysics, existence and essence -- Avicenna on common nature -- Thomas Aquinas on being and essence -- John Buridan on essence and existence -- God's existence and essence -- Augustine on divine immutability -- Anselm of Canterbury on God's existence -- Thomas Aquinas on God's existence and simplicity -- Practical philosophy -- Goodness and being -- Augustine on evil as the privation of goodness -- Augustine on the origin of moral evil -- Boethius on being and goodness -- Thomas Aquinas on the convertibility of being and goodness -- Freedom of the will -- Augustine on the "divided will" -- Boethius on divine providence and the freedom of the will -- Anselm of Canterbury on free will -- Henry of Ghent on the primacy of the will -- Virtues and happiness -- Boethius of Dacia on the supreme good -- Thomas Aquinas on happiness -- Divine law, natural law, positive law -- Thomas Aquinas on natural law and positive law -- John Duns Scotus on natural law and divine law.