"Jesus Himself said, 'If you think you love God but hate your brother, you are a liar. The truth is not in you.' If that doesn't shake an unforgiving person to the core, I'm not sure what would." - Carter Conlon
Stress put on the fact that regeneration is a supernatural work of God, not a mere assent of man's mind. If someone has no interest and no hope in the heavenly things, this is a sign that that man is not born again.