Natural Law in the Spiritual World by Henry Drummond explores the relationship between the laws observed in the natural world and the principles of spiritual life. Drawing on Christian theology, science, and philosophical reflection, Drummond examines whether spiritual development can be understood through patterns and laws comparable to those found in nature. The book considers subjects such as faith, spiritual growth, character, human nature, and the development of religious life. Drummond uses observations from biology and the natural sciences as illustrations for discussing concepts such as regeneration, growth, dependence, and the relationship between the individual and the divine. A notable work of nineteenth-century Christian thought, Natural Law in the Spiritual World offers readers a historical exploration of the intersection of science, religion, morality, and spiritual development.