An excellent and practical sermon on what it means to be "led by the Spirit," (Romans 8.14). It's only 25 pages, and, doctrinally, it demystifies much of the modern take on being "led by the Spirit," correcting some abuses and confusions which accompany that (mis)understanding. Practically, it has a concise description, helps to, and benefits of being led by the Spirit. It's from the Rev. Thomas Jacombe in Volume 3 of "The Mornihg Exercises at Cripplegate," or "Puritan Sermons" on Logos, pp. 585-610. I've linked below to the free version from Google Books.