What does the Bible say about the truth of God and man?

According to Romans 3:4, 'Let God be true but every man a liar.' This profound statement establishes that the ultimate truth about humanity comes from God alone. In contrast, man's understanding and assertions about himself are often tainted by sin and self-deception. The book of Romans thoroughly exposits the nature of man, demonstrating that all people are dead in trespasses and sins (Ephesians 2:1), guilty before God (Romans 3:19), and in desperate need of salvation that only God can provide.