There was no illusion about who the early disciples saw.
7 Then the disciple whom Jesus loved said to Peter, “It is the Lord!” As soon as Simon Peter heard him say, “It is the Lord,” he wrapped his outer garment around him (for he had taken it off) and jumped into the water. 8 The other disciples followed in the boat, towing the net full of fish, for they were not far from shore, about a hundred yards. 9 When they landed, they saw a fire of burning coals there with fish on it, and some bread.
10 Jesus said to them, “Bring some of the fish you have just caught.” 11 So Simon Peter climbed back into the boat and dragged the net ashore. It was full of large fish, 153, but even with so many the net was not torn. 12 Jesus said to them, “Come and have breakfast.” None of the disciples dared ask him, “Who are you?” They knew it was the Lord. 13 Jesus came, took the bread and gave it to them, and did the same with the fish. 14 This was now the third time Jesus appeared to his disciples after he was raised from the dead.
“Then the disciple whom Jesus loved said to Peter, “It is the Lord!” Peter “wrapped his outer garment around him and jumped into the water.”
How can we not like this man?! Here he is, a man of action, impulsive, passionate and childlike. He leaps into the water. He is so excited to see his friend that there is no holding him back. He wades and plunges to get to Jesus without even giving much thought to it.
Then, there is breakfast preparation going on. Jesus has set up the campsite. He has a fire going. He had his own breakfast on the fire and needed more fish for his friends who were coming ashore. “Bring some of the fish you have just caught,” he said. They did. Then, He cooked their fish. These are things easily missed but they are the kind of detail there is in the story of Jesus’ resurrection that reveals there was no illusion about who the early disciples saw.
Those nail scarred hands had fish smell on them. His clothing was saturated with the smell of wood smoke. He had his sleeves rolled up and had dropped fish on hot coals with bread he had already made for their breakfast.
It was absolutely necessary that those disciples were convinced this was the living Jesus so that no one could shake their confidence later concerning what they had seen and who it was they had seen. Who cannot put their confidence in this type of testimony?