The Idiot
"The Idiot" by Fyodor Dostoevsky is a novel published serially in 1868–1869. It follows Prince Myshkin, a young nobleman whose Christian goodness and innocence lead worldly society to mistake him for simple-minded. Dostoevsky sets his "positively good and beautiful man" against the passions, desires, and egoism of contemporary Russian life, testing whether true Christian love can survive in a corrupt world. The result is a deeply personal work exploring profound moral and spiritual questions.
Possibly a revision of the 1887 translation by Frederick Whishaw. Wikipedia page about this book: en.wikipedia.org/wiki/The_Idiot