In a word, Reformed theology is fundamentally about grace. . . .--James K. A. Smith, Letters to a Young Calvinist (Grand Rapids: Brazos, 2010), 14
At its heart, Calvinism is simply a lens that magnifies a persistent theme in the narrative of God's self-revelation: that everything depends on God. Everything is a gift.
This wonderful book is a short, accessible series of 23 letters, each a few pages long, written from the perspective of an older saint who is helping walk a younger man into the Reformed faith. The two consistent themes throughout the book are (1) Reformed theology is inherently self-contradictory if it breeds pride, and (2) there is much more to Reformed theology than the five points.
Our brother Justin Taylor has another nice excerpt from the book here. Dr. Smith briefly introduces the book at his blog here. Tullian helpfully comments on one of the main themes of the book here.