Although Lewis describes his intellectual journey to the Christian faith in Surprised by Joy and The Pilgrim's Regress, the actual steps of his progress from Atheism to Theism are still a matter of controversy. Based on Lewis' letters, his diary All My Road Before Me and recently published sources (in particular ‘Early Prose Joy’), this paper gives an outline of the main steps of Lewis' philosophical progress during the 1920s. The first part sketches the five main stages Materialism, Realism, Absolute Idealism, Subjective Idealism, and Theism, and submits a proposal for their dating. The second part describes these stages in greater detail and discusses the reasons that urged Lewis to adopt a new philosophical position at a particular time. It will become apparent that a thorough philosophical understanding of these stages is an indispensable prerequisite for any serious effort to establish a chronology of Lewis' intellectual progress during these years.
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