Journal April 1839
p39“A fair friend talented, and united with me in high esteem for Byron exclaimed: every thing that can be said, religious or moral in the world is contained in the three last words of Cain: Goethe.”
Fuller, Margaret. "Journal April 1839." Houghton Library, Harvard University; bMS Am 1086 (Box A); Box 5 (99).
Pages 39–46 of the journal contain a long sequence of excerpts and paraphrases from Goethe's maxims and conversations, attributed to 'G.' or 'Goethe' throughout.