Romans 3:1-8 describes the nature of God’s faithfulness, that he is a God who is faithful to keep his promise to save even the unfaithful. Our unfaithfulness does not stop God from being faithful; even when we are unfaithful God will prove who he is to believers and unbelievers (Romans 3:3-4).

Romans 3:3 says that all humans are unfaithful and unrighteous, but God is just, and his faithfulness is how he demonstrates his authority to bring justice. 

Believers (like Paul) have been entrusted with sharing the truth of this nature of God through sharing who God says he is through his word (Romans 3:2). But God is responsible for making this characteristic understood by believers and unbelievers (Romans 3:5). 

Paul writes that a person who does not understand the nature of God’s faithfulness reasons that, 

“If all people are unfaithful and unrighteous; and 

“If God can prove his faithfulness even to the unfaithful, then

“Why does God condemn me? 

“Why do I need to believe in God? 

“God is not just he is unjust in bringing wrath on us because 

“We are unable to be faithful since only he is faithful (Romans 3:5-8).”

The person who reasons like this does not know who God is, they choose disbelief and condemn themself. It isn’t their faithfulness or goodness that keeps them from God’s wrath or saves them from condemnation, it is God’s faithfulness and God’s goodness that saves the unfaithful and makes them faultless and righteous on the day of God’s judgement. 

The way that God’s faithfulness demonstrates his justice is that he has made a way of salvation for everyone who believes, and this shows his faithfulness to the unfaithful. Only God could do this through the righteous sacrifice that Jesus made through his death and only belief in his power to do this makes it possible for the believer to receive the promise of righteousness before God. 

The Holy Spirit allows God’s word to be understood. The message of God’s faithfulness was revealed to Paul who writes that believers are “servant(s) of God and apostle(s) of Jesus Christ to further the faith of God’s elect and their knowledge of the truth that leads to godliness—in the hope of eternal life, which God, who does not lie, promised before the beginning of time, and which now at his appointed season has brought to light through the preaching entrusted to (believers like Paul) by the command of God our Savior” (Titus 1:1-3).