What is 'H.C.F.' as referenced in the C.S. Lewis book 'Mere Christianity' written during World War 2 in the early 1940s?

Answer 1

Yes, 'C.S. Lewis' uses the abbreviation 'H.C.F.' in the forward to his book "Mere Christianity" based on radio talks he made during World War II in the early 1940's.

H.C.F. is an abbreviation for Highest Common Factor. Lewis to explaining what his book is about. His book is not about the difference between any two Christian denominations. Lewis presented the common or central theme in all denominations of Christianity. He goes on to say that this common Christian belief across all denominations is substantial. He words this "not only positive but pungent". i.e. this common factor across all Christian denominations is strong.

Answer 2

In "Mere Christianity," H.C.F. stands for "Highest Common Factor," which C.S. Lewis uses as an analogy to explain the core moral values that are shared across different cultures and religions. Lewis argues that while there may be differences in how these values are expressed, there is a common moral code that unites humanity.