Among all books written by Paul through the Holy Spirit conviction, the book of Romans is the most classic and comprehensive letters concerning the gospel. This book has (1) laid down the pure concepts of the gospel (the righteousness of God is by faith from first to last); (2) combined the practicality of the gospel (rely on the new way of the Spirit, live by testing and approving the perfect will of God); (3) eventually led to the universality of the gospel, such that people who have listened and believed in the gospel will not only remain in knowing the gospel, but all the more have a heart of indebtedness to all people developed in them, desiring to spread the gospel to new groups of people. Actually, the history and generations have all acknowledged the importance of Romans. Martin Luther said, “This letter is truly the most important piece in the New Testament. It is purest Gospel”. Calvin said, “If we can really understand this volume of letters, it is opening the door to all the mysteries of the treasure.” The father of bible English translations (William Tyndale) said it is: the principal and most excellent part of the New Testament, a light and a way in unto the whole scripture. ..the more it is studied the easier it is, the more it is chewed the pleasanter it is.” The greatest of the early church fathers (Augustine of Hippo) was also awakened from his hedonistic lifestyle and bondage of the lust through this book, thus repented and made borned again. There’re few fundamentals in this books of Romans (deemed as the cornerstone of Romans) we need to grasp: <1:6> The gospel is the power of God that brings salvation to everyone who believes (salvation is God-driven); <3:23> for all have sinned and fall short of the glory of God (to understand truly what sin is); <4:13> It is not through the law that Abraham and his offspring received the promise that he would be heir of the world, but through the righteousness that comes by faith (made righteous by faith); < 5:8,20> But God demonstrates His own love for us in this: While we were still sinners, Christ died for us…But when sin increased, grace increased all the more (the assurance of being made righteous by faith); <6:14> For sin shall no longer be your master, because you are not under the law, but under grace (the sanctification of people made righteous by faith); <7:6> We serve in the new way of the Spirit, and not in the old way of the written code (knowing flesh and Holy Spirit); the work of the Holy Spirit and all saints are more than conquerors; Lord’s sovereign purpose in Jews and Gentiles, revealing the predestined grace of God; Rely on the Holy Spirit in testing and approving the perfect will of God, living out the glorious image of Christ; Connecting travel mates in greetings. All these are the thread in the book of Romans, revealing 2 great themes: 1 The Gospel is the power of God that brings salvation to everyone who believes 《1:16》,2 The Holy Spirit residing in people who believe in the gospel is revealing God’s good, pleasing and perfect will practically《12:2》. Actually, the gospel that Romans mentions includes the truth that is fundamental and connected. If we lose the primary foundation or remain on the foundation and not extending it to all areas of our lives and living, we will soon lose the essence of the gospel and fall into a faith that is humanistic, or the theological truths that are powerless.