How does A Treatise on God as First Principle explain what reason can prove about God?

In his work A Treatise on God as First Principle (Tractatus de primo principio), John Duns Scotus argues that while human beings' ultimate goal—union with the divine Trinity—is known only through divine revelation, philosophy possesses the capacity to prove the existence of an infinite being.1

Duns Scotus contended that physical proofs, such as the Aristotelian concept of God as the primary mover, were insufficient. Instead, he utilized an intricate metaphysical demonstration to establish God as the absolutely primary, unique, and infinite being. By incorporating the Anselmian argument into this framework, he posited that the notion of an "infinite being" serves as the most perfect concept of God available to human reason. This philosophical demonstration serves as a vital service to theology, providing a rational foundation for understanding the divine nature before moving into the realm of faith and love.21