“The gospel is not about behavior modification.” – Joseph Prince
Matthew 9:12-13 KJV But when Jesus heard that, he said unto them, They that be whole need not a physician, but they that are sick.  But go ye and learn what that meaneth, I will have mercy, and not sacrifice: for I am not come to call the righteous, but sinners to repentance.
So we see contrary to the opinion of Joseph Prince, Jesus came specifically for the behavior modification of sinners. This is inherent in the definition of repentance. Repentance is not only sorrow for wrong doing, but stopping the wrong or sinful behavior.