When dialogue with Christians around you seems to be carnal and unedifying, you can always read a good 'practical' Christianity book. The Puritans were masters at ethics and Christian living. Many Christians have found sweet fellowship with Thomas Boston, John Owen, or Thomas Manton because of their level of spiritual maturity.
When your preacher is dry and boring, or when his exegesis is poor, there are many sermon books that will delight your soul! Be encouraged, rebuked, and challenged by the preachers who were giants preaching to giants.
In those times when all around you seems to be dark, books are a blessing to a hungry believer. The Apostle Paul was alone and in prison at the end of his life. Many of the Christians that had been around him for most of his ministry had abandoned him. What does he ask for? II Timothy 4:13 says, "when thou comest, bring with thee, and the books, but especially the parchments." Paul sought fellowship in the Scriptures (parchments) and his books.
In my library I have profitably dwelt among the shining lights, with which the learned, wise, and holy men of all ages have illuminated the world. -Richard Baxter