The only definition of repentance in the New Testament is "a change of mind." I could change my mind about eating shrimp or I could change my mind about walking to the park. Both are a change of mind but they concern different things. Jesus was speaking of the specific change of mind that leads to someone trusting Jesus. We Christians have already made this change of mind.
Another translation for "saved" is "cured" or "made well." If you are "saved" you are no longer sick because Jesus "makes you well" thus you have no need to repent, that is to change your mind to trust Jesus to be saved, cured, or made well. You've already done it. I don't think Jesus was saying "I never call the righteous to change their mind about anything."
Jesus said, “It is not those who are well who need a physician, but those who are sick. I have not come to call the righteous, but sinners, to repentance" (Luke 5:31-32). When Jesus was saying this everyone was sick because He had not yet gone to the cross to cure people of sin with His blood. Jesus "ate and drank with the tax collectors and sinners” (Luke 5:30) because those who know they need a physician will accept treatment.
Those who are too proud to believe that they are sick or those who think they can cure themselves (in this case with their own good works) will reject the physician. Jesus didn't want to waste time with those who would reject Him. Jesus preferred to go to the spiritual hospitals of the humble rather than the houses of the self-righteous who refused treatment because they denied their sinful condition.
If you take repentance to mean "change of mind" which it does:
- Righteous people don't need to change their mind from unbelief to trust in Jesus to be saved because they have already trusted in Christ and are already saved.
- Righteous people don't need to change their mind as a whole because they have the mind of Christ. Who would want to get rid of that?
- Righteous people do need to change their mind when they discover something they believe to be false.
- Righteous people do need to change their mind about performing unloving actions. A change of mindset is much more effective and longer lasting than a mere change of action or behavior.
- Righteous people do need to change their mind as God leads them to. He may lead you to change your mind about your perspectives, courses of action, manners of approach, about almost anything. Allow God to renew your mind by being open to Him and honest with Him. He may challenge you to change your mind about something you've always held to be true or something that is dear to you.
- Righteous people don't need to turn from sin because as Acts 3:26 tells us "God raised up Jesus and sent Him to bless you by turning every one of you from your sinful ways."
- Righteous people don't need to turn from sin because Christ took away sin. What is there to turn away from if it is gone?
- Righteous people don't need to turn from sin but scripture tells us to "put to death the deeds of the flesh" (Romans 8:13, Colossians 3:5). That doesn't mean turn away from sin but to claim the victory that our righteousness through the blood of Christ has already won over it. Recognize His grace and by it you will reject godless ways and worldly desires (Titus 2:12).
When you make repentance (changing your mind) into something you force yourself to think or do you aren't allowing Christ to renew your mind. You may unknowingly be trying to change yourself for the worse! Repentance is most often something natural and unspoken. It is like a child wanting a cookie who is then offered a piece of pie. The child forgets all about the cookie. Repentance is not a work we do to gain or regain God's approval. Repentance is agreeing and cooperating with God's revealed love.
Forgiven and Loving - Looks at the totality of our forgiveness, what it means to "confess sins," and includes another look at the meaning of repent.