42:21-24 The office of conscience is to bring to mind things long since said and done. When the guilt of this sin of Joseph's brethren was fresh, they made light of it, and sat down to eat bread; but now, long afterward, their consciences accused them of it. See the good of afflictions; they often prove the happy means of awakening conscience, and bringing sin to our remembrance. Also, the evil of guilt as to our brethren. Conscience now reproached them for it. Whenever we think we have wrong done us, we ought to remember the wrong we have done to others. Reuben alone remembered with comfort, that he had done what he could to prevent the mischief. When we share with others in their sufferings, it will be a comfort if we have the testimony of our consciences for us, that we did not share in their evil deeds, but in our places witnessed against them. Joseph retired to weep. Though his reason directed that he should still carry himself as a stranger, because they were not as yet humbled enough, yet natural affection could not but work.
17-24. put them … into ward three days—Their confinement had been designed to bring them to salutary reflection. And this object was attained, for they looked upon the retributive justice of God as now pursuing them in that foreign land. The drift of their conversation is one of the most striking instances on record of the power of conscience [Ge 42:21, 22].