“who show the work of the law written in their hearts, their conscience also bearing witness, and between themselves their thoughts accusing or else excusing them)” (Romans 2:15).
As mentioned earlier, this reference to the “heart” is a translation of the word kardia in the original language of this passage. “Kardia” refers to our innermost being in a physical, emotional, intellectual, or spiritual sense. Here, in Romans 2:15, we observe the interplay between one’s heart and his or her conscience.
The “conscience” refers to “the soul as distinguishing between what is morally good and bad, prompting to do the former and shun the latter, commending one, condemning the other.” (1) Another source defines the conscience as. “that faculty of the mind, or inborn sense of right and wrong, by which we judge of the moral character of human conduct.” (2)
Much like an umpire, judge, or referee at a sporting event, the conscience serves as an arbiter of right and wrong. When those without access to God’s Word do what is right, the conscience judges accordingly and excuses their behavior. When they violate their consciences by engaging in inappropriate thoughts or behaviors, the conscience plays an accusatory role.
The human conscience thus enables us to assess our actions and motivations by functioning as an internal prosecutor or defense attorney. Today, when access to the Bible is widely available, our consciences should yield to the Biblical Scriptures in affirming or rejecting a particular thought, motive, or action.
For example, the Word of God should lead and inform our consciences based on the authority of Christ. Jesus validated His authority through His miracles (Mark 2:1-12) as well as His resurrection from the dead (John 20). Jesus affirmed the truth of the Biblical Scriptures (John 17:17) and accepted them as the Word of God (John 10:34-35) as well as the command of God (Matthew 15:3-4). He thus stands as the final authoritative source that should govern our consciences.
While our consciences serve as valuable guides when they are informed by God’s Word, they are not infallible. As Paul the Apostle said to the church at Corinth, “My conscience is clear, but that does not make me innocent. It is the Lord who judges me” (1 Corinthians 4:3 NIV), Therefore, as one translation paraphrases this section…
“When the Gentiles, who have no knowledge of the Law, act in accordance with it by the light of nature, they show that they have a law in themselves, for they demonstrate the effect of a law operating in their own hearts. Their own consciences endorse the existence of such a law, for there is something which condemns or commends their actions” (Phillips).
Image Attribution: Ludovic Péron, CC BY-SA 3.0, via Wikimedia Commons
(1) G4893 syneidesis https://www.blueletterbible.org/lexicon/g4893/kjv/tr/0-1/
(2) “Conscience.” Easton, M. G. Easton’s Bible Dictionary.

” Our moral inclinations are manifested in our reactions when others violate our rights; we don’t see the moral law nearly as clearly when we violate others’ rights… But again our sinfulness is not found in our inability to know what the moral duty is but in our unwillingness to do it to others.” (2)
First, we can say that no one (including those who do not possess the Old Testament Law) can deny the self-evident existence of “right” and “wrong.” A simple dialogue with someone who does not believe the concepts of “right” and “wrong” exist help demonstrate that reality…