The Christian has to prove that nothing escapes the eye of a just and holy God; that he lays bare every secret thought, searches every hidden purpose, and scrutinizes every desire and every movement of the mind. He thus discovers and brings to light all the secret sins of the heart. Men in general take no notice of heart sins; if they can keep from overt sins in life, from open acts of immorality, they are satisfied. What passes in the secret chambers of imagery they neither see nor feel. Not so with the child of grace; he knows the experience described in Psalm 139. He carries about with him the secret conviction that the eye of God reads every thought. Every inward movement of pride and self-righteousness, rebellion, discontent, peevishness, fretfulness, lust, and extravagance, he inwardly feels that the eye of God reads all, marks all, condemns by his righteous law all, and because he is so intrinsically pure, hates and abhors all.
Thus he proves, among the "all things" which are weighed up and measured in the inward court of conscience by the unerring standard of the word of truth, the light of the Spirit's teaching, and the workings of godly fear, that he is a sinner before God, and that of a deeper dye and more crimson hue than any other transgressor, for he sees and knows his own heart, which nobody else can see or know. He is indeed aware that many may have sinned more deeply and grossly as regards outward acts; but he feels that no one can have sinned inwardly more foully and continually than he; and this makes him say with Job, "I have heard of you by the hearing of the ear; but now mine eye sees you; wherefore I abhor myself and repent in dust and ashes" (Job 42:5, 6).