And the Lord said unto Cain. God now proceeds against Cain himself, and cites him to His tribunal, that the wretched man may understand that his rage can profit him nothing. He wishes honor to be given him for his sacrifices; but because he does not obtain it, he is furiously angry. Meanwhile, he does not consider that through his own fault he had failed to gain his wish; for had he but been conscious of his inward evil, he would have ceased to expostulate with God, and to rage against his guiltless brother. Moses does not state in what manner God spoke. Whether a vision was presented to him, or he heard an oracle from heaven, or was admonished by secret inspiration, he certainly felt himself bound by a divine judgment. To apply this to the person of Adam, as being the prophet and interpreter of God in censuring his son, is constrained and even frigid. I understand what it is which good men, not less pious than learned, propose, when they sport with such fancies. Their intention is to honor the external ministry of the word, and to cut off the occasion which Satan takes to insinuate his illusions under the color of revelation. Truly I confess, nothing is more useful than that pious minds should be retained, under the order of preaching, in obedience to the Scripture, that they may not seek the mind of God in erratic speculations. But we may observe, that the word of God was delivered from the beginning by oracles, in order that afterwards, when administered by the hands of men, it might receive the greater reverence. I also acknowledge that the office of teaching was enjoined upon Adam, and do not doubt that he diligently admonished his children: yet they who think that God only spoke through his ministers, too violently restrict the words of Moses. Let us rather conclude, that, before the heavenly teaching was committed to public records, God often made known his will by extraordinary methods, and that here was the foundation which supported reverence for the word; while the doctrine delivered through the hands of men was like the edifice itself. Certainly, though I should be silent, all men would acknowledge how greatly such an imagination as that to which we refer, abates the force of the divine reprimand. Therefore, as the voice of God had previously so sounded in the ears of Adam, that he certainly perceived God to speak; so is it also now directed to Cain.

Why art thou wroth? - This was designed as a gracious warning, and a preventive of the meditated crime.

And the Lord said unto Cain, why art thou wroth? and why is thy countenance fallen?.... Which was said not as being ignorant of his wrath and resentment, but to bring him to a conviction of his sin or sins, which were the cause of God's rejecting his sacrifice, and to repentance and amendment; and to show him that he had no cause to be displeased, either with him or his brother, for the different treatment of him and his offering; since the fault lay in himself, and he had none to blame but his own conduct, which for the future he should take care to regulate according to the divine will, and things would take a different turn.