Deductive Reasoning and the Law of Human Nature

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In the first excerpt from the text Mere Christianity, C.S Lewis makes an argument for the existence of a Law of Human Nature using deductive reasoning. Deductive reasoning begins with a broad statement and comes to a conclusion about an individual idea. In the excerpt given from chapter one, Lewis introduces the concept of law, the physical and biological laws humans cannot disobey which is a universal concept. He makes the claim that there is a law “peculiar to his human nature, the law he does not share with animals or vegetables or inorganic things,” and this law people can choose to disobey. In this quote, he is shifting from general laws to the idea of a law of Human Nature. He makes his opinion known when he states “they thought that the human idea of decent behavior was obvious to everyone. And I believe they were right.” Through deductive logic, Lewis allows the reader to contemplate these natural laws, which he uses as the basis to his argument for the existence of a Law of Nature. Moreover, through experience, Lewis claims that everyone has an idea as to what decent behavior looks like or should be. He replies to the objection that different civilizations have different moralities by asserting that they are actually more similar than …show more content…

Also, everyone is biased in some way and convincing the reader of the validity of one’s opinion(s) is hard per se. Logical persuasion needs to have ample and rational evidence to back up an idea, more than just experience. Lewis provides statements based on experience but I do not think it was enough. First, everyone perceives experience differently. Second, he gave too little examples that did not provide enough support for his argument. In order to persuade the reader, the author must give more than one or two sources with efficient support or examples and the argument must make

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