This section of verses is one of the most difficult and troubling passages in the New Testament. A person can hear the truth again and again, yet without ever making a commitment to Christ, and through rejecting the truth, that person develops a hard heart towards God. Through persistent refusal to listen to God, a person can reach a point where they no longer can repent — whether that be through their eventual death or through their debased mind that refuses to acknowledge God (Rom. 1:21-28). A serious passage like this calls for us to examine our lives and to evaluate whether we are growing love for Christ or dullness toward Him.