The book outlines six key objections against Calvinism: it undermines the moral character of God, erodes human moral responsibility, threatens the purpose and nature of the visible church, leads to damaging effects on individual moral character and social happiness, departs from biblical interpretation, and allows extreme views of divine decrees to distort Christian doctrine. Hull's intent is not just to challenge Calvinist theology but to preserve what he views as the proper and moral understanding of God’s role and human free will within scriptural teachings.Although On Calvinism is a critique rather than a comprehensive theological treatise, it continues to be a significant historical resource in examining the intellectual debates of the 19th century concerning predestination, divine sovereignty, and free will. While written for an Anglican audience, it remains insightful for readers studying the intersection of theology, history, and ecclesiastical tradition in the context of the Calvinist movement. Hull’s work is notable for its clarity and direct opposition to the TULIP framework (total depravity, unconditional election, limited atonement, irresistible grace, and perseverance of the saints), and it asserts that these beliefs misrepresent both scripture and God’s moral nature.