In 1894 he said in a letter to a  Not for a minute am I free of the thought that I must, am obliged to write.
He wrote a letter in 1894 that he felt he had to write.
mnli hypothesis: He wrote a letter in 1894 that he felt he had to write. premise: In 1894 he said in a letter to a  Not for a minute am I free of the thought that I must, am obliged to write.