Krasiński was critical of the revolutionary Spring of Nations. In 1850 his health worsened, but that did not stop his constant travels, including to France. Through letters and audiences with European figures, including Napoleon III, whom he met in 1857 and 1858, he sought to gain support for the Polish cause. In 1856, in Paris, he took part in the funeral of Adam Mickiewicz. On 24 November 1857, in a major blow to Krasiński, his father died. Krasiński himself shortly died, in Paris, on 23 February 1859. His body, like his father's, was transported to Poland and laid to rest in the family crypt at Opinogóra. Today the former family estate of the Krasiński family is the site of the . Krasiński is best known for his Messianist philosophical ideas and tragic dramas. Key themes in his writings include the necessity of sacrifice and suffering to moral progress, and providentialism. His relation to his father, who strongly influenced – indeed, controlled – many aspects of his life, is also seen as a major influence in his writings. Krasiński's early works, particularly his historical novels such as "Agaj-Han" recounting the story of Marina Mniszech, were influenced by Walter Scott and Lord Byron and extolled medieval chivalry. Krasiński's best-known work is the drama "Nie-boska komedia" (The Undivine Comedy). In the 19th century, a still greater Polish Romantic poet, Adam Mickiewicz, discussed "The Undivine Comedy" in his lectures at the Collège de France, calling it "the highest achievement of the Slavic theater". A century later, another Polish poet and lecturer on the history of Polish literature, Nobel literature laureate Czesław Miłosz, called "The Undivine Comedy" "truly pioneering" and "undoubtedly a masterpiece not only of Polish but... of world literature", and noted how surprising it is that such a brilliant drama could have been created by an author barely out of his teens. Krasiński's "Undivine Comedy" effectively discussed the concept of class struggle before Karl Marx had coined the phrase. "The Divine Comedy" appears to have been inspired by the author's reflections on the disastrous Polish November 1830 Uprising and on the French July 1830 Revolution. It contemplates social revolution, predicts the destruction of the nobility, and comments on societal changes wrought by western Europe's burgeoning capitalism.