“Holding faith, and a good conscience; which some having put away concerning faith have made shipwreck” (1 Timothy 1:19)
The natural man can build a solid case for sin. Whatever remains of his conscience, which would urge him against an evil course of action, can be swept away by a barrage of justifications. Of course, devils are also complicit in prodding us to think, speak, and do what seems right to us, but will lead to our death. When you add to this toxic mix a theological justification for sin there is nothing left to oppose one’s march down an evil path toward an evil end.
“Behold, ye trust in lying words, that cannot profit. Will ye steal, murder, and commit adultery, and swear falsely, and burn incense unto Baal, and walk after other gods whom ye know not; And come and stand before me in this house, which is called by my name, and say, We are delivered to do all these abominations?” (Jeremiah 7:8-10)
Conscience is God’s first line of defense against sin. But it is a tender thing – which when repeatedly run over becomes marred, broken, and voiceless. Conscience no longer functions in a reprobate mind. We do what we do with impunity – there is no fear of God before our eyes. We call evil good and good evil. Yes, we can even steal, murder, and commit adultery with “good” reason.
Your conscience is one of your most valuable possessions. Hold on to it. Nothing in all the world is worth its loss. Treat it with respect and tender care. Violate it at your own peril.