“And as Jesus passed forth from thence, He saw a man, named Matthew, sitting at the receipt of custom: and He saith unto him, ‘Follow Me.’ And he arose, and followed Him. And it came to pass, as Jesus sat at meat in the house, behold, many publicans and sinners came and sat down with Him and His disciples. And when the Pharisees saw it, they said unto His disciples, ‘Why eateth your Master with publicans and sinners?’
But when Jesus heard, 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.’” Matthew 9:9-13 (KJB)
What do the sick and the sinner have in common? When the sick know they are sick they will; at least in most cases; seek out a physician or someone who can help them. When the sinner realizes they are a sinner they will seek for a savior; for someone who can and will deliver them from their sin.
In the above verses Jesus had just called a publican [tax collector] to Himself. His name is Matthew. Mark and Luke call him Levi. He is a Hebrew collecting taxes from his own people. Many of the Hebrew people; especially the Pharisees despised the Jewish men who did such a thing.
The Pharisees also rejected and despised Jesus. Many of the people who came to Jesus were those who were rejected by the religious hierarchy, sick, weak, hungry, fearful, despised, and rejected by many others.
My summation of the above is this: When you know you are sick you will seek for help; when you know you are lost you will seek help; when you know you are a sinner you will seek for a savior. There is no help or savior for those who are safe and secure within themselves.
Before you can be delivered from your sin you must realize you are a sinner. Jesus Christ is the only one who bled and died on the cross for your sins and mine; He was buried, and He rose again. Trust in Him and His work on the cross; believe Him and be saved.