According to the terms set by the steward, they were all free to go and continue their journey, and only Benjamin must stay as Joseph’s servant, but they would have none of it. They all return to the city with Benjamin; they will not leave him.
When God brings us under conviction, there is nothing we can do to clear ourselves. We must accept the verdict of the law and agree with it. We must allow the law to condemn us and seek God’s mercy as our only way of deliverance.
Christ may have much work to do in our hearts before he brings us to conversion. Like Saul of Tarsus, we may feel the pricks, the goads working in our consciences, but like a stubborn ox we may kick against them. Even when a person has been forced to see some of his sins and feel the shame of them, he has not yet necessarily come to the point where he repents of sin in its entirety. For the brothers, that point was only reached now. Often there is a master sin which the Lord uses to convince us of our total sinfulness and which leads to true repentance.
If God is against us then he does not account for the way he punishes us. He may bring all kinds of trouble into our lives, and it is useless for us to claim that we are innocent. He is not accountable to us for the providences he introduces into our lives.
There is a dispute over the translation of the words ‘Wot ye not that such a man as I can certainly divine?’. Aalders prefers to render them ‘Don’t you know that a man like me would be sure to notice?’ But the KJV may be right; Joseph is playing the part of an Egyptian.