A lot of people think that pointing out sin is the great highlight of Matthew 18. It makes a lot of believers feel spiritual, when they are able to point out the sins and weaknesses of others. It does not.
Jesus Christ did not die on the cross, so His church can be experts in pointing out the sins of their brethren. Any Pharisaical and self-righteous person, deluded into thinking that they have no sin can do that, APART FROM THE CROSS OF GOD’S SON.
SIN IS REBELLION TOWARDS GOD, IT IS POSSESSING AND EXHIBITING A WRONG KIND OF JOY IN SOMEONE OR SOMETHING ELSE, IT IS BEING MISTAKENLY HAPPY IN SOMETHING OR SOMEONE ELSE AND IT IS BEING ENTIRELY DISCONTENT IN GOD.
THE REAL WORK IS CALLING THEM BACK TO SUBMISSION AND JOY AND GLADNESS AND CONTENTMENT IN CHRIST—IN GOD.