I believe that the greatest iniquity is pride. If we have pride then we will not acknowledge the Lord.
We will think that we don't need God.
The truth is that we are sinners that needs to repent from our sins. The issue of pride is a problem.
People don't like to be wrong. When a person repents from their sins then they acknowledge that we are sinners.
The prideful heart will reject the Lord so the Lord hate the pride. The Lord can't forgive a person that don't want to repent. So that person will go to hell because of their sins.
God is merciful but if a person don't want the pardon. That person will get punished in eternal damnation.