The Kingdom of God Is Within You by Leo Tolstoy is a groundbreaking philosophical work that presents his views on nonviolent resistance and the moral teachings of Christianity. In this book, Tolstoy argues that the true meaning of Christianity is found not in church doctrines or rituals, but in the individual's personal relationship with God and adherence to Jesus' teachings of love, compassion, and nonviolence. The work was influential in inspiring figures such as Gandhi and Martin Luther King Jr. for its emphasis on pacifism and moral integrity.