Jonathan Edwards’ classic book Religious Affections is the free audio book for the month of August at Christian Audio.
From the website:
The Religious Affections is quite possibly one of the most important books ever written by America’s greatest theologian. Among the questions asked is, “What is the nature of true religion?”, “What are the signs of a true revival?”, and “How is the heart changed?”. Edwards used his pulpit and his leadership of the Great Awakening to pen one of the most challenging and inquisitive books ever written.
Faith by Hearing 