Reminder re: Dr. Ladd or Dr. Martin can't remember which said that whenever you come across the term "therefore" you have to go back to see what is is there for.
This statement's subject is the preceding list of of sins and debauchery. The fact is, we all have sinned and fallen short of God's expectation, (Romans 3:23)

Because we're libel we're deserving of God's judgment (2) and this deserving flows from a hardness which doesn't see, acknowledge or believe that God will judge us. (3-4).

vv. 6-11 Just as salvation is through the Jew first then the Gentile so is God's wrath. and the key here is that our works will determine God's response.

having said that remember that since it is impossible for us to really one of those he describes as NEV "by patience in well-doing seek for glory and honor and immortality". Once again notice the phrase "for the Jew first and also for the Greek". This is the third and fourth usage of

vv. 12-16 The LAW is the means whereby our judgment is executed. Structurally it is subordinate to the previous section starting with a 'gar' or "because".

Romans 2:1