The conscience of man has been likened by some to a living organ. Like all organs, the conscience has a primary function; the primary function of the heart is to pump blood around the body, the kidneys remove waste products and excess fluids from the body; the liver helps break down food in digestion and rids the body of toxins. The primary function of the conscience is to sound to man objective and unaltering morality so as to point him in the way of righteousness. There are many similarities between a conscience and an organ, and perhaps chief among them is the ability to render corrupt and ineffective, that once-living organ through repeated abuse! Paul referred to a people who had seared their consciences. You say, how does one sear their conscience? Simple, just keep sinning against your better conscience, keep on ignoring its accusing voice and it will eventually cease to work!!
It’s one thing to harden one’s heart against his conscience, but what happens when a man hardens his heart against the voice of God! What happens, when God the Holy Spirit brings conviction to bear in such a palpable and overwhelming manner such that you know that you know this is the voice of God and yet you choose to continue on in the sin God’s convicting you of? What happens, when God brings His written Word to bear in your hearts shedding revelatory light such that the cloak of sin is blown away and your sin is laid bare before you, and yet, you make excuses and take again the cloak of sin? I tell you what happens...God the Holy Spirit is grieved; the conscience is wounded and the heart is hardened. A word of warning goes out in this sermon, “Today if ye will hear his voice, Harden not your hearts…”.