Defend the Faith Like C.S. Lewis, Part 1
Learn how C.S. Lewis used reasonable, logical arguments to defend the faith.
by Robert Velarde
At one point in the classic book The Lion, the Witch and the Wardrobe by C.S. Lewis, an exasperated professor utters the words, "Logic! Why don't they teach logic at these schools?" Lewis not only believed in truth, but also in our ability to use logic as an aid in determining truth.
Although it is true that logic studied as a formal discipline can lead to challenging formulas and diagrams, in a basic sense we all use it regularly. In reading this article, for example, you are using logic to interpret the words you see. Without logic, you could not make sense of this sentence. Interpreting a rational sentence requires a rational mind with the ability to comprehend words that are structured in a way that makes sense — in short, words that are organized logically.
Historically, Aristotle was the first to explore logic as a formal discipline, but he did not invent it. The underlying principles of logic are readily discernible. We use them every day to get through some of the simplest decisions and actions in life.
Logicians generally offer four broad principles or laws of logic.
First, the law of identity makes the obvious observation that something is itself and, therefore, cannot be something else (A is A).
Second, the law of non-contradiction deals with the concept of antithesis and states that something cannot be true and not true at the same time and in the same sense (A is not non-A).
Third, the law of excluded middle is often presented as "either A or non-A." For instance, God either exists or He does not exist.
Fourth, the law of bivalence assesses propositions as either being true or false. "God exists" is either a true or a false statement…
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|Recommended Resources: Mere Christianity | C. S. Lewis's Case for Christ: Insights from Reason, Imagination and Faith | The Case for Christianity|
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