His interest in comparative religion led to his becoming founding editor of the journal Religious Studies, holding the post from 1964 to 1979.
[5] Michael Marsh in a review wrote the book offered a "substantial defense" for interactionist dualism.
[7] Lewis was a Christian who sought common ground between the world's religions and argued there is a sense of transcendental reality in all of them.
"[9] The philosopher Gareth Matthews gave the book a negative review claiming Lewis had offered no evidence for dualism.
According to Matthews the belief that the self can pop in and out of existence would be alarming to some readers but Lewis had no problem with accepting this view.