The Epistle to the Romans is one of the letters of the New Testament canon of the Christian Bible. In the words of N.T. Wright, the Book of Romans is "neither a systematic theology nor a summary of Paul's lifework, but it is by common consent his masterpiece. It dwarfs most of his other writings, an Alpine peak towering over hills and villages. Not all onlookers have viewed it in the same light or from the same angle, and their snapshots and paintings of it are sometimes remarkably unalike. Not all climbers have taken the same route up its sheer sides, and there is frequent disagreement on the best approach. What nobody doubts is that we are here dealing with a work of massive substance, presenting a formidable intellectual challenge while offering a breathtaking theological and spiritual vision."
(Summary from Wikipedia).