Romans is largely regarded as the theological standard among New Testament writings, as well as the clearest and most systematic presentation of Christian doctrine in all the Bible. Its influence on figures such as Augustine, Luther, and Calvin have been well documented, with Calvin referring to it as the singular key to understanding all of Scripture.

In Shades of Grace, the first in his New Kingdom series, pastor and author Marc Simon offers both an original translation of Paul's letter to the Romans, as well as a fresh commentary on the letter itself. His spirited approach to the Pauline corpus conveys both the depth and simplicity of Paul's writing, and combines the author's careful scholarship and spiritual insight with lucid commentary, background information, and explanatory notes on key terms used by Paul in his letters.

The introduction to the commentary highlights the authorship, occasion, purpose, and contents of Romans, as well as Paul's unique understanding of Israel's God as the Father, Lord, and Spirit of creation. The author follows the introduction with a verse-by-verse exposition of the text, which is at once accessible to scholars, pastors, and students alike.