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God as Pure Actuality and Infinite: For Aquinas, God is Pure Act (Actus Purus), meaning He is entirely actualized, without any potentiality. He is infinite, not in a quantitative sense, but in the sense that His being is unlimited and perfect. This infinity of God means He is beyond our full comprehension in this life.
Natural Desire for Knowledge: Aquinas argues that there is a natural desire in all intellectual creatures (humans and angels) to know the cause of things. This desire ultimately points to the First Cause, which is God. To have perfect happiness, this natural desire must be fulfilled. If our intellect could not reach the first cause, our natural desire would remain unfulfilled, and thus perfect happiness would be impossible.