Roman 1:18-25

1. Universality:

"The wrath of God is revealed from heaven against all ungodliness and unrighteous of men."
"...His divine nature have been clearly seen"

The subject is not just Israel, but all men. Paul was taking about all the nations. Paul's letter is for the believers in Rome, but the content is about all the nations. There is universality in the book of Roman.

2. What is the wrath of God?

"therefore, God gave them over in the lusts of their heart..."
If God is judging you, you are safe still.
God's wrath is not about judgment, but about "giving them over".
God's chasement is for our good. The judgment to the Israelite mentioned in the OT are all for the goodness of His people.

3. Why God angry?

"they exchanged the truth of God for a lie."
What is meant by the truth of God? "His invisible attributes, His eternal power and divine nature, which have been seen and understood"

Supposed that you are an employee of a shop, say jewelry. The owner of the shop goes oversea and let you take care of the shop. What if you took all the jewelry for your own goodness? What if you gave the jewelry to the enemy of the owner, just to please them?

4. This passage is a counter part of v16-17, the righteous shall live by faith.

God is pleased if we trust in Him, while God is angry if we exchange the truth of God for a lie.

We should trust in Him that Jesus is the Son of God resurrected from the dead (v4). Paul set his example of living by faith. He was under obligation to share the gospel of Jesus to the nations (v.14). He was not ashamed of the gospel. We should also not be ashamed of the gospel, but preach the gospel to the nations. (v14-16)