“They that are whole (healthy) have no need of a physician (doctor), but they that are sick: I came not to call the righteous, but sinners to repentance. Mark 2:17
When Jesus said He was not calling the righteous, but sinners to repentance, we must remember that no one is righteous in God's eyes; - Only God is good (Mark 10:18) – no one is righteous (Romans 3:10) – God calls all men to repent (Acts 17:30). So what does Jesus mean by saying He was not calling the righteous, but sinners to repent?
Jesus compares the need for repentance to the need for a doctor. When a person is healthy, or believes they are in good health, why seek a doctor?
But then the person may have a yearly check-up by a doctor, who finds a disease that is hard to notice. To convince the patient to take treatments for the illness, the doctor may show test results or even x-rays. The patient now will see what is wrong, and how much he needs to take action to fix the problem, even if the cure is expensive and/or uncomfortable.
And it is like this when it comes to the need for repentance. If a person does not recognize that they are a sinner separated from God, they will not receive the call for repentance. This lack of genuine repentance is the underlying problem which has brought the “falling away” of this last age. The “doctor” of scripture says that we suffer from the disease of sin, and that disease will kill us (Romans 6:23). The cure that we seek is the MERCY of God, poured out abundantly toward us through the blood of Jesus Christ.
One sin, any sin, separates us from a Holy God. Most will not admit they have this disease. It is a terminal sickness that has but One cure. The price has already been paid, but they will not accept their condition before God, and refuse the cure.
It's not too late, while we are still alive. The great doctor has revealed our disease, but we must reach out for the cure.