A cosmological argument is any argument that uses the existence of the world to infer the existence of God. In this episode, we examine two of the three best-known and debated cosmological arguments: Aquinas’ argument from change, and Liebnitz’ argument from contingency. Aquinas sees God as the force that pushes the universe forward, allowing concrete objects to change from potential to actual. Liebnitz asks the question, “Why is there something instead of nothing?” and concludes that God must be fundamental and necessary, since the universe cannot be.