There is a time to confront another person's sin in order to save his or her soul (James 5:19-20). We are not judging when we recognize and deal with sin in another person's life. Judging involves deciding someone is not worthy of saving, that they have no value. In a sense one could say that not confronting sin is judging the sinner because our lack of action says the person is not worth the effort.
But when we confront a person, we are to guard against comparing ourselves with them. We are to keep in mind that put in the exact same circumstance and history, we would likely make the same decision (2 Timothy 2:24-26; James 4:6; Galatians 6:1-5). Remember to say to yourself, "but for the grace of God, that would be me."
