Aquinas provides five arguments for the existence of God: 1) The argument from motion - All change requires an unchanging first mover as initiator, which is God. 2) The argument from causation - An infinite chain of causes is impossible, so there must be a first cause, which is God. 3) The argument from contingency - All contingent beings rely on a necessary being for their existence, which is God. 4) The argument from degrees of perfection - Standards are needed for qualities like goodness, which is God. 5) The argument from design - Purpose and direction in nature imply an intelligent designer, which is God.