Practical Mysticism is an introduction to the field of mysticism, written by Evelyn Underhill. The book is designed to be accessible to readers with no prior knowledge of the subject, and it provides a clear and concise overview of the key concepts of mysticism. Underhill argues that mysticism is not a religion or a philosophy, but rather a universal human experience that can be found in all cultures and traditions. She describes the different stages of the mystical journey, and she offers practical advice on how to develop one's own mystical potential.