Written at the beginning of the world apocalypse which was World War II, The Beginning and the End is Nikolai Berdyaev's main book on eschatology. He describes his book as an "essay in the epistemological and metaphysical interpretation of the end of the world, of the end of history", hence he calls it an "eschatological metaphysics." For Berdyaev the end of the world is a divine-human enterprise: man not only endures the end, but he also prepares the way for it. Man's creative activity is needed for the coming of the kingdom of God: God is in need of this activity and awaits it. Berdyaev tells us that the eschatological outlook is not limited to the prospect of the end of the world, it embraces every instant of life. This is how he puts it: "What one needs to do at every moment of one's life is to put an end to the old world and to begin a new world.