In philosophy, there are various ways of categorizing philosophical subdisciplines and areas, for instance, the four major historical eras, namely; ancient, medieval, modern, and contemporary philosophy. Focusing on the medieval philosophy, it refers to dominant philosophical or theological thought from the 5th to the 15th centuries C.E. It is characterized halfway by the way toward rediscovering the ancient culture created in Greece and Rome in the classical period, and mostly by the need to deliver theological problems and to incorporate sacred doctrine with common learning. The issues discussed all through this period are the purpose of theology and methaphysics, the existence of God, the relation of faith to reason, and the complication of knowledge, of universals, and of individuation. One of the notable thinkers of the era, St. Bonaventure appears here, not as an imperfect follower of Aristotle and St. Thomas Aquinas, but...