Miracles (book) in the context of "C. S. Lewis"

Miracles is a book written by C. S. Lewis, originally published in 1947 and revised in 1960. Lewis argues that before one can learn from the study of history whether or not any miracles have ever occurred, one must first settle the philosophical question of whether it is logically possible that miracles can occur in principle. He accuses modern historians and scientific thinkers, particularly secular biblical scholars, of begging the question against miracles, insisting that modern disbelief in miracles is a cultural bias thrust upon the historical record and is not derivable from it.

In a chapter on "The Naturalist and the Supernaturalist" Lewis gives technical definitions to the two terms. Naturalists, under his definition, believe that the Universe is a vast process in which all events which ever happen find their causes solely in the events that happened before them within the system. Supernaturalists believe that interruptions or interferences can take place in this system of our Universe from some other system outside it. In particular, a supernaturalist believes that the natural world was created or derived from a supernatural entity. A supernatural event would be one that is not traceable, even in principle, solely to materially determined causes within our Universe. Libertarian free will, if it exists, would have to be supernatural under this view.