Genesis 44:14 When Judah and his brothers came to Joseph’s house, he was still there. They fell before him to the ground. Joseph said to them, “What deed is this that you have done? Do you not know that a man like me can indeed practice divination?” And Judah said, “What shall we say to my lord? What shall we speak? Or how can we clear ourselves? God has found out the guilt of your servants; behold, we are my lord’s servants, both we and he also in whose hand the cup has been found.” But he said, “Far be it from me that I should do so! Only the man in whose hand the cup was found shall be my servant. But as for you, go up in peace to your father.”
And Judah said, what shall we say unto my lord? what shall we speak?…. Signifying that they were nonplussed, confounded, knew not what to say; they could not acknowledge guilt, for they were not conscious of any, and yet could not deny the fact, the cup being found on one of them; and though they might have a suspicion of fraud, yet were afraid to speak out what they suspected, and therefore were at the utmost loss to express themselves: or how shall we clear ourselves? to assert their innocence signified nothing, here was full proof against them, at least against their brother Benjamin: God hath found the iniquity of thy servants; brought it to their remembrance, fastened the guilt of it on their consciences, and in his providence was bringing them to just punishment for it; meaning not the iniquity of taking away the cup, which they were not conscious of, but some other iniquity of theirs they had heretofore been guilty of, and now God was contending with them for it; particularly the iniquity of selling Joseph; this was brought to their minds before, when in distress, and now again, behold, we are my lord’s servants, both we, and he also with whom the cup is found; hereby fulfilling his dream more manifestly than ever; for, by bowing down to the earth to him, they might be thought to do no other than what all did, that came to buy corn of him; but here they own themselves to be his servants, and him to be lord over them, and to have dominion over them all, and them to be his slaves and bondmen. (Gill)
These brothers have lived with the guilt of their sin for 22 years. This guilt has not left them and as they matured the sin they committed against Joseph haunts them. They know they deserve to be punished not only for what they did to Joseph but the heart ache and distress they caused their father Jacob. Judah, the instigator of the harsh treatment to Joseph has surely repented but has no means to forgive himself for the intended harm to Joseph. Likewise the brothers were of the same mind.
Guzik says it so perfectly: We might take pride because we are innocent of some sin or another, yet we are guilty of far greater. You can’t hide from your sin. Time does not erase the guilt of your sin; only the blood of Jesus can.