Idolatry
Romans 1:23: And changed the glory of the incorruptible God into an image made like corruptible man—and birds and four-footed animals and creeping things.
Glorify God
Romans 1:21: Because, although they knew God, they did not glorify Him as God, nor were thankful, but became futile in their thoughts, and their foolish hearts were darkened.
No Excuse
Romans 1:20: For since the creation of the world His invisible attributes are clearly seen, being understood by the things that are made, even His eternal power and Godhead, so that they are without excuse.
Evidence
Romans 1:19: Because what may be known of God is manifest in them, for God has shown it to them.
Heaven’s Revelation
Romans 1:18: For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who suppress the truth in unrighteousness.
Live by Faith
Romans 1:17: For in it the righteousness of God is revealed from faith to faith; as it is written, “The just shall live by faith.”
Not Ashamed
Romans 1:16: For I am not ashamed of the gospel of Christ, for it is the power of God to salvation for everyone who believes, for the Jew first and also for the Greek.
Ready to Preach
Romans 1:15: So, as much as is in me, I am ready to preach the gospel to you who are in Rome also.
Obligations
Romans 1:14: I am a debtor both to Greeks and to barbarians, both to wise and to unwise.