Reflecting later on Lewis’s long engagement with his story, Tolkien’s gratitude is manifest. “The unpayable debt” he owed to Lewis, he said, was his “sheer encouragement”—over many years—to keep on. “He was for long my only audience,” Tolkien explained. “Only from him did I ever get the idea that my ‘stuff’ could be more than a private hobby. But for his interest and unceasing eagerness for more I should never have brought The L. of the R. to a conclusion.”
