But I tell you the truth, it is to your advantage
that I go away; for if I do not go away, the Helper
will not come to you; but if I go, I will send Him to you.
And He, when He comes, will convict the world
concerning sin, righteousness, and judgment;
concerning sin, because they do not believe in Me.
...but that the proclamation of Christ is the great revealer of sin, the great distinguisher of men. When Christ is preached, the touchstone is applied, and men are convicted of being sinners and of the depths and hideousness of their sin by their exhibited attitude toward the Son of God....There is no revelation of character so accurate, so powerful, so unmistakable, so inevitable, as that wrapped up in the simple question, "What think ye of Christ?" ...And all who come not are demonstrated to be sinners, and the depth of their sin is thus revealed.
Benjamin B. Warfield
The Person and Work of the Holy Spirit