The article presents theological thoughts on eschatological themes of Sergei Bulgakov, one of the most prominent theologians and priests in the Russian Orthodox Church in the late 19th and early 20th century. These themes touch on theological concepts of God’s last judgment, heaven and hell. Bulgakov interprets God’s last judgment in a very modern way, as a confrontation of the truth with its own primordial image in the idea of God. To the extent that the ‘final’ life of the person who has lived it differs from the best version of what it could have been if God’s will had been followed, so does the pain of unrealised happiness. The outcome of such a confrontation with truth is either heaven or hell. For Bulgakov, hell is not infinitely eternal. He believes that at the very end, when time and space no longer exist, those in hell can still experience God’s mercy. Hell is a lost God, heaven is a found God. Such thoughts are made all the more dramatic by the fact that Bulgakov’s work took place at a difficult political, economic and cultural time, both in Russia and in Europe, with the Bolshevik October Revolution, the First World War, and the Second World War. The influence of these processes on theology is also a focus of the article.