“They demonstrate that God’s law is written in their hearts, for their own conscience and thoughts either accuse them or tell them they are doing right” (Romans 2:15 NLT).

CONSCIENCE AND THE CREATOR’S LAW
In chapter one of Romans, Paul made the case that humanity is without excuse because God’s character has been revealed in God’s creation. In this second chapter, Paul builds on that case by showing that knowledge of God’s law is written in the human conscience. Both of these revelations of God, found in creation and conscience, bear witness of God’s eternal existence and righteousness, so that God is justified in His judgments concerning humanity.
 
In addition to God’s general revelation through creation and conscience, He has given us the special revelation of the gospel of Jesus Christ, through which all who believe might be saved and all who reject are condemned already.