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Natural knowledge of God's existence is seen in the order of creation.
Natural theology is the school of thought that holds: that God can be known through reason and observation of the natural world. I.e. that knowledge of God is naturally available to us.
In his work, Institutes of Christian Religion, he writes "all people recognize that there is God and that he is their creator. This, in fact, points to a sense of divinity inscribed in the hearts of all people". In this, Calvin is suggesting that all people have an innate sensus divinitatis or, a divine sense which draws them to God. He identifies three distinct areas in which humans can experience the sensus divinitatis:
Taking a naturalistic approach to ethics, Calvin argues that our conscience is God-given, and the internal feeling of guilt a person has when they know that they have done something wrong helps humans to understand God's goodness.
Holding that humans are the only element of creation to find appreciation in aesthetics, he argues that when we experience this appreciation of the beauty of the natural world we understand more about God's work.
The ability to reason that comes from the intellectual capacity of being human is the final element in which we experience the sensus divinitatis. The ability to reason about the intricate detail and finely tuned design in the universe helps humans to discern God's existence as a designer.
Explaining how natural theology can reveal knowledge of God to us, Calvin provides an analogy. He describes God's creation as a mirror. The beauty, complexity, and goodness seen in the world reflect the attributes of God.
Calvin was not the first scholar to argue that humans have an innate understanding of God. This view can be traced back to the Roman philosopher Cicero. He proposed the Universal Consent Argument in which he concluded that humans have an instinct to believe in God. Cicero's conclusion is based on the premise that people across all civilizations have a belief in some form of the divine as well as a universally held belief in the existence of an immortal soul. He deduced that if so many people believe in God, then not only is it reasonable to argue for his existence, but also that he simply must exist.
This argument is mirrored in scripture where Paul, on an evangelistic mission, finds the Athenians worshipping the "unknown God" (Acts 17:22-23). This act indicated to Paul that these people, who had not yet learned about God, were still engaging in religious practices. They seemed to have an innate understanding of God that, whilst devoid of specifics, communicated a sense of a profoundly significant being worthy of devotion and worship.
📎 In his work Critique of Practical Reason, Immanuel Kant wrote "Two things fill the mind with ever-increasing wonder and awe…the starry heavens above and the moral law within me". Here, Kant is pointing to the view that humans can gain an understanding of God using natural theology. The 'starry heavens' indicate to Kant the vast, significant order of creation which, for him, rationally comes from God.
Second, 'the moral law within' is further proof to Kant for God's existence. He holds that all humans have an innate ability to reason about morality. An understanding of his three postulates explains how this moral law leads Kant to knowledge of God.
Kant does not think that the moral law is a code of ethics given by God to guarantee moral action, instead, he argues through the postulate of freedom that all humans have an innate free will, the ability to both do good and evil. The free choice to do the right, dutiful thing, leads to the second postulate of immortality.
When people choose to fulfill their good will they will be rewarded, since it is evidently clear that this reward does not come in this life, it would be irrational to deny the existence of immortality and life after death. In order for there to be a life after death in which people are rewarded for their free moral choices, there must be a being who can transcend the Earthly, phenomenal world, and fairly distribute that reward.
For Kant, the only rational judge is God. Thus, through the three postulates, we can see why Kant believes that the moral law within us contributes to gaining knowledge of God.
Through our study of Aquinas in other units in this course, it is clear to us that he would defend the notion that humans can learn about God through natural theology.
We would use his teleological and cosmological arguments to argue that the natural order, design, and regularity within the world point to the existence of a designer. We would also use his concept of natural law and the God-given ability to reason & make moral decisions to illustrate his view that the "law of God is written on their hearts".
Aquinas would use the existence of guilt within his understanding of the conscience to explain that, just like Calvin postulated, the notion of guilt helps one to understand God, to learn about his eternal law, and ultimately gain knowledge of him. All of these points within an essay could be used as stand-alone lines of argument rather than synoptic links, however, more detail would need to be given than I have done here. You would need to explain specifically how, according to Aquinas, these views indicate that humans can gain knowledge of God through natural theology.
As above, this would not be a synoptic link and, for the right question, could be a line of argument in itself. Full details on Paley's argument can be found in the arguments from the observation revision guide, but, essentially: through his design qua purpose and design qua regularity arguments, Paley is arguing that humans have an ability to gain knowledge about God's existence through natural theology. Especially as seen in the order of creation.
Karl Barth and Emil Brunner were both Swiss theologians and ministers of the Calvinist Tradition. While Barth rejected natural theology on the basis of the fall, Brunner was influenced by the Thomist (those who agree with Thomas Aquinas) idea that reason can be used to identify aspects of God. The debate between the two was very much a debate about what Calvin's theology meant and the essays that they wrote were published together in 1946.
Brunner's essay came first. He held that the effects of the fall are not as damming as some might suggest, providing the following justifications:
In an essay simply titled "Nein!" (German for no) Barth responded to Brunner. He outlined three reasons for this objection:
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