And Yosef saw his brothers and recognized them and made himself foreign to them and spoke harshly and said: “from where have you come?” and they said: “from the land of Canaan to buy food.” And Yosef recognized his brothers but they did not recognize him. (Bereishit 42: 7-8)

Why does the Torah repeat Yosef’s ability to identify his brothers? Repetition may indicate two layers of recognition. Ibn Ezra explains that the first layer refers to a general understanding that a group of his brothers descended to Egypt. At a later point, Yosef takes note of each sibling on an individual basis. For Ramban, the second stage refers to a more definitive identification. At first, Yosef suspected that his brothers stood before him; then, their claim of Canaanite origin certified his supposition.

Rashi cites an intriguing midrashic comment. Perhaps the extra verse refers not to physical identification but to a moral posture. The brothers did not see Yosef as a brother; they considered killing him and ultimately sold him into slavery. Yosef, on the other hand, remembered brotherly responsibility. Even as he accused them of spying, he never truly intended to harm his brothers.

Why does the recognition occur only in one direction? Rashi explains that the brothers already had beards at the time when they sold Yosef so they basically looked the same as he remembered. Yosef was yet without a beard when the brothers last saw him; therefore, they failed to identify their sibling. Ramban questions this interpretation since Yissachar and Zevulun were not much older than Yosef and Yosef should have had the same difficulty recognizing them. He explains that having identified the older brethren, Yosef could easily figure out who the younger brothers were based on their family association.

Ramban adds another interpretation of psychological acuteness. Our ability to identify things often depends upon our expectations. When some possibility seems extremely foreign to us, we may reinterpret evidence indicating the truth of that possibility. Yosef knew about the famine and expected his starving family to search for food in Egypt. His brothers had no reason to think that the brother they sold into slavery had risen to second in command of the era’s most powerful nation. Therefore, all resemblance to Yosef seemed a coincidence to them.

Perhaps we can ad a deeper layer as well. The brothers had always failed to identify Yosef. The younger child they viewed as a nuisance receiving unjustified favoritism had some crucial talents that they could not admit to. Developing circumstances eventually brought them to confront the truth about their talented sibling.