Final answer:
Thomas Aquinas developed the Five Ways, which include arguments for the existence of God based on empirical evidence and the observation of the natural world. His philosophy, influenced by Aristotle, seeks to justify God's existence through logical principles rather than solely on church doctrine. The Five Ways cover concepts such as the unmoved mover, first cause, necessary being, absolute being, and grand designer.
Step-by-step explanation:
The philosophy devised by Thomas Aquinas that includes rationales for the existence of God is known as the Five Ways, which are considered part of natural theology. Aquinas' argumentation does not rely on the Church's authority but rather on logical and observable principles in the natural world. The Five Ways proposed by Aquinas are the arguments from the unmoved mover, the first cause, the necessary being, the absolute being, and the grand designer, all of which are heavily influenced by Aristotelian metaphysics and epistemology.
Aquinas' approach to proving God's existence significantly differs from the likes of Anselm's ontological argument, as Aquinas emphasizes empirical evidence and investigation of the physical world to assert the need for a first cause. This led to his assertion that some entity must have the role of a prime mover or a grand designer to account for the order and purpose observed in the world. His philosophies are a blend of Aristotelian principles, Christian theology, and his observations of the natural world.
Moreover, his teleological argument stems from observing the inherent design within reality and draws conclusions about the existence of an intelligent designer, in this case, God, responsible for such order and design.