1. John Piper. Finally Alive. 160 pages. Christian Focus Press. One of my favorite books. Piper makes clear what it means to be saved--breaking it down for us to understand. This book gave me a deeper love for the gospel, a greater sense of who God is (and thus, I can worship God more richly), and motivated me for evangelism.
2. Francis Chan. Crazy Love. 192 pages. David C. Cook Press. This was a great book--challenging me in areas of my lukewarmness and giving me a better sense of God's love for me. I really appreciated the online videos that went with the chapters--really worthwhile.
3. D.A. Carson. Call to Spiritual Reformation. 230 pages. Baker Academic Press. Great book on prayer. This helped me to pray richer, fuller, more expectant prayers. I often struggle with what to pray for people. This book showed me how to better use Scripture in praying for others.
4. Owen Strachan and Doug Sweeney. Jonathon Edwards on True Christianity. 160 pages. Moody Publishers. Really challenging. These two authors take 18th century preacher Jonathon Edwards sermons and admonish the present-day readers to take his words seriously. This book focused on nominal Christianity--where people claim the name of Jesus, but don't have His fruit in their life.