"A Diary of Private Prayer" is a collection of prayers written by John Baillie, a Scottish theologian, in the early 20th century. The book is designed to guide individuals in their personal prayer life, offering daily prayers for various occasions and emotions. It emphasizes the importance of reflection and connection with the divine. The prayers are structured to be used over a month, with each day focusing on different themes such as gratitude, forgiveness, and guidance. This work has been appreciated for its poetic language and deep spiritual insight, making it accessible for both individuals and groups seeking to enhance their prayer practices.