The second part of the proverb uses this to teach us what we see when we look at another human being. As we look beneath the surface, beyond the physical features, we see the man inside, the “heart of man”. Honest consideration tells us this too is but a reflection of ourselves.
There is no essential difference in the heart of one human being from another. Our needs, our desires, our search for happiness, are found in the hearts of others too. Jesus taught us to put this truth into practice in consideration of others. “Therefore all things whatsoever ye would that men should do to you, do ye even so to them” (Matthew 7:12a). The kindnesses we want, they would too.
The Bible teaches us that the problem of sin also rests equally in the heart of every person. “What then? are we better than they? No, in no wise ... There is none righteous, no, not one” (Romans 3:9-10). We also read that, “there is no difference: For all have sinned, and come short of the glory of God” (Romans 3:22c-23).
In God's view, your worst enemy has a heart like yours. The man in the pulpit was born with a heart like the hearts that sit before him in the pews. The man in Skid Row has the same birthright. The nationality or religion of one's parents makes no difference. The same heart problem afflicts the whole human race. God's warnings about a fiery judgment against sin is everyone's concern.
God's solution to this is to offer a new heart. “A new heart also will I give you, and a new spirit will I put within you: and I will take away the stony heart out of your flesh, and I will give you an heart of flesh” (Ezekiel 36:26). The power to change a man in such a fundamental way was provided when God's Son died on the cross for our sins and rose again. It is by believing in Jesus Christ as your own personal Saviour that you can receive this new heart and be be made ready for heaven.