"Natural Law in the Spiritual World" is a book written by Henry Drummond, a Scottish scientist, and evangelist, first published in 1883. The book explores the intersection of science and spirituality, seeking to reconcile the principles of natural law with religious beliefs. Drummond begins by examining the laws of nature as understood by science, drawing upon principles such as evolution, adaptation, and the conservation of energy. He argues that these laws govern not only the physical world but also the spiritual realm, suggesting that there is a natural order to the universe that extends beyond the material plane. Throughout the book, Drummond explores various spiritual concepts, such as divine providence, the nature of God, and the purpose of human existence. He suggests that just as physical laws govern the natural world, there are also spiritual laws that govern the moral and ethical dimensions of life. One of the central themes of the book is the concept of love as the supreme law of the universe. Drummond argues that love is not only a fundamental principle of morality but also a driving force behind the evolution of life itself. He explores the transformative power of love in human relationships, as well as its broader implications for society and the world at large. "Natural Law in the Spiritual World" has been praised for its insightful exploration of the relationship between science and religion. Drummond's accessible writing style and thoughtful analysis have made the book a classic in the fields of theology, philosophy, and spirituality. Overall, "Natural Law in the Spiritual World" offers a compelling argument for the existence of spiritual laws that govern the universe, inviting readers to consider the profound implications of these laws for their own lives and beliefs.