... recurring moments of joy and the sustained impact of George MacDonald's Phantastes, which Lewis said "baptized" his imagination, convinced him that there was in reality something to be sought and found.
... Lewis's Oxford friend Owen Barfield convinced him that if physical reality is all there is, thought itself (being a mere byproduct of matter) would lack validity and significance. To maintain his [W.T.] Kirkpatrick-inspired quest for a rational account of reality, Lewis saw that he must believe, as he later expressed in Miracles, that "reason is something more than cerebral bio-chemistry."
... in the mid-1920s, through the impact of friends and of G.K. Chesterton's The Everlasting Man (1926), he found himself thinking that "Christianity was very sensible apart from its Christianity."
... Certainty about the Incarnation came two ... after a late-night talk with J.R.R. Tolkien gave him the idea that the pagan dying-and-rising-god myths were "good dreams" given by God to prepare the ground for myth to become fact in Jesus of Nazareth.