"For I say to you, that unless your righteousness exceeds the righteousness of the scribes and Pharisees, you will by no means enter the kingdom of heaven." Matthew 5.20The Kingdom of Heaven is purely righteous. Once there, you will have no memories of what is unrighteous. In order to enter, you must be righteous.
But how can we be righteous when we are merely human and sinners? Abraham's faith, along with his obedience to the Word of God, made him a righteous man.
Therefore, you must use your faith in obedience to the Word.
