Good afternoon.
At the Tolkien Society Christopher Tolkien Conference on Sunday, Verlyn Flieger mentioned poigniantly a letter (of 1958 IIRR) where JRR wrote "I cannot do this any more" (about some important aspect of his writings). Can anyone point me to where this letter has been published? I know Tolkien came to a point where he felt it was all beyond him, but I've never read the primary source.