We must give thanks and honor our God for the great sacrifice He made for humanity. His death on the cross was to get us out of the error that our hearts had. The apostle Paul says the following:
1 And you hath he quickened, who were dead in trespasses and sins;
2 Wherein in time past ye walked according to the course of this world, according to the prince of the power of the air, the spirit that now worketh in the children of disobedience:
Ephesians 2:1-2 (KJV)
This makes us understand that before Christ died on the cross for us, we were involved in whatever things our minds dictated to us, being totally deceived by the enemy.