Dogs bark because they're dogs. Cats meow because they're cats. People sin because they're sinners. Our social and moral problems are the direct result of heart decease.

"The human heart is the most deceitful of all things, and desperately wicked. Who really knows how bad it is?" (Jer 17:9)  Let's take a look at "human nature". Doing so helps to understand the desperate need we have to be changed.

Our natural Human Nature 

evil thoughts, sexual immorality, theft, murder, adultery, greed, wickedness, deceit, eagerness for lustful pleasure, envy, slander, pride, foolishness, hate, envy, murder, fighting, deception, malicious behavior, gossip, backstabbing, hating God, insolent, proud, boastful, disobedient to parents, breaking promises, heartless, unforgiving, impure thinking, idolatry, participation in demonic activities, hostility, quarreling, jealousy, outbursts of anger, selfish ambition, divisions, feeling that everyone is wrong except those in your own little group, envy, drunkenness, wild partying, greedy, rage, malicious behavior, slander, dirty language

Mk.7:20-23; Rom.1:29,30; Gal.5:17-21; Eph. 4:19-22,31; Col.3:5-8