Next to Romans, Galatians provides more information about the nature of faith and its distinction from works. It is also an extremely exegetical challenging book. Whether its Paul's cryptic statements about 'dying on a tree' or his enigmatic and metaphoric understanding of Hagar and Sarah, Galatians has many places were unskilled Bible interpreters may become confused and frustrated.
But there are also lucid sections, and clear presentation of the doctrine of 'faith alone'. Galatians: Gospel-Rooted Living by Todd Wilson is trustworthy commentary that adroitly navigates the exegetical pitfalls while clearly presenting the Gospel of grace. Expository in format, and text-centered throughout this commentary will inform and inspire as you come to understand how to live in light of Christ and his salvation.