How does conscience testify to the existence of God?

The conscience serves as an internal arbiter, reflecting God's moral law written upon every human heart. Romans 2:14-15 explains that Gentiles, who do not have the Law, show the work of the Law written in their hearts, as they instinctively know right from wrong. This innate moral compass indicates accountability to a higher standard and signifies the presence of a moral lawgiver, which is God. When individuals feel guilt or moral conviction, they are responding to this divine imprint, further affirming the existence of God as it aligns with their understanding of right and wrong.