In That Hideous Strength the narrator recalls a walk he took through a secluded wood:
I was quite alone; and it felt more like the loneliness of a very large room in a deserted house than like the ordinary solitude out of doors. I remember thinking, “This is the sort of place which, as a child, one would have been rather afraid of or else would have liked very much indeed.” A moment later I thought, “But when alone – really alone – everyone is a child: or no one?” Youth and age touch only the surface of our lives.
C.S. Lewis, That Hideous Strength
[This excerpt is from the third volume of Lewis’ Space Trilogy, which I’ve been re-reading (lost count of how many times I’ve read through the books). Here’s a quote from Out of the Silent Planet, and another from Perelandra.]