Following his incarceration in 1924, Douglas's feelings towards Wilde began to soften. He wrote in "Oscar Wilde: A Summing Up" that "Sometimes a sin is also a crime (for example, a murder or theft), but this is not the case with homosexuality, any more than with adultery". Throughout the 1930s and until his death Douglas maintained correspondence with many people, including Marie Stopes and George Bernard Shaw. Anthony Wynn wrote the play "Bernard and Bosie: A Most Unlikely Friendship" based on the letters between Shaw and Douglas. One of Douglas's final public appearances was his well-received lecture to the Royal Society of Literature on 2 September 1943, entitled "The Principles of Poetry", which was published in an edition of 1,000 copies. He attacked the poetry of T. S. Eliot and the talk was praised by Arthur Quiller-Couch and Augustus John.