For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who by their unrighteousness suppress the truth (Romans 1:18).
ERV: God’s anger is shown from heaven. God is angry with all the evil and wrong things that people do against God. They have the truth, but by their evil lives they hide the truth.
You may remember that Romans 1:19-20 told us that God reveals Himself through nature. We see in verse 18 that something else is also “being revealed”—the wrath or anger of God. This anger is against all of man’s sinful ways. Some, of course, doubt that God is really angry. They do not see or feel all His anger right now. Paul goes on in the second chapter of Romans to explain that there will come “the day of God’s wrath” when God’s anger and judgment will be fully revealed. Until then, it is being stored up (Romans 2:5).