Scholars disagree about why Peter and the other disciples went fishing.
Some scholars believe Peter and these disciples returned to their old job of fishing. Jesus had appeared a few times, but most of the time people could not see him. So these scholars think the disciples did not believe Jesus was going to do anything more.
Other scholars think these disciples were fishing because they needed food. They also needed to earn some money by selling fish. They were waiting for Jesus to tell them what he wanted them to do.
When John wrote about the "disciple whom Jesus loved", he wanted his readers to think about himself. John often wrote about himself by writing "other disciple" or "disciple whom Jesus loved" (See: John 13:23, John 18:15-16, John 20:3-8). Scholars think John wrote this way because he wanted to be humble.
The disciple whom Jesus loved called Jesus "the Lord" to honor him. This disciple was John. He first recognized the man was Jesus. He said to Peter the man was “the Lord.” John that understood Jesus is God. So he used a word that many people used to honor God.
The Greek word that is translated as "the Lord" is the same word that the Jews used when speaking about God. Therefore, whenever Jesus is called this, the Jews would have thought about God. They would have thought that people were saying that Jesus is God.
Peter "threw himself into the sea" to swim to shore to see Jesus. He was excited that Jesus had come. So he wanted to get to shore as fast as he could. He also needed to go to the shore to pull the net full of fish onto the shore (see: 21:11). To throw oneself into the sea is to jump out of the boat and into the water.
John does not say how he knew there were 153 fish. Some scholars think God wanted to say something special about the number of fish. But most scholars think John knew they caught exactly 153 fish. Fishermen like to count their fish.
John wrote that this was "the third time Jesus showed himself to the disciples after he had risen from the dead" so his readers would think about the first two times that John wrote about when Jesus appeared to the disciples. The first appearance was when Jesus appeared to all of the disciples except Thomas. This happened on Sunday after the crucifixion (see: John 20:19-23). He appeared again to all the disciples a week later (see: John 20:24-29). This is the third time he appeared to seven disciples that Jesus was writing about.
When Jesus called Peter "Simon Peter" and "Simon son of John", he used different names for Peter. Simon was the name his parents gave him when he was born. Jesus had named him Peter, so he was often called Simon Peter after that (see: Matthew 16:16, Luke 22:31-34, and John 18:10). Peter was also called the son of John because his father’s name was John (see: Matthew 16:17).
When Jesus said "more than these", he wanted Peter to think about the other disciples. Jesus asked Peter if Peter loved him more than the other disciples loved him.
When Jesus spoke about "lambs" and "sheep", he used a metaphor for new Christians. He wanted to say that they had a lot to learn about God and Jesus. Peter had to teach them these things. So Jesus used a metaphor about feeding sheep to speak about this teaching.
Peter said that Jesus "knew all things" because he had followed Jesus long enough to know that Jesus was very wise. In fact, he knew that Jesus is God. So, because God knows all things, Jesus must know all things. Jesus knows all things (see: Matthew 12:25, Matthew 22:18, Mark 2:8, Luke 6:8, Luke 11:17, Luke 16:15, and John 2:25).
When Jesus spoke what he spoke in 21:18, he wanted Peter to think about how Peter would die. He wanted to say that Peter would be crucified. In the Roman world, speaking about "stretching out" the hands was a way to speak about crucifixion.
Nobody wanted to die by being crucified. So Jesus said Peter would have to go where he would not want to go.
Scholars think Peter was crucified in Rome during the rule of the Roman Emperor Nero. This was about 30 years after Jesus said these words.
Jesus told Peter to "follow" him because he knew Peter was not certain if Jesus still wanted Peter as a disciple. Peter had denied Jesus three times before Jesus was crucified (see: John 18:17-27). So Peter did not know if Jesus still wanted him. Peter did not know what he should do now. Jesus answered this question Peter thought about but did not ask. Jesus made it very clear to Peter what he should do. Peter should continue to follow Jesus.
The other disciple Peter asked about was John. Peter wanted to know about John’s life and death. Jesus told Peter to focus on his own life and death, not John’s. Peter needed to obey what God wanted him to do, and John needed to obey what God wanted him to do. Each Christian must follow Jesus by obeying him and doing the things he wants them to do.
John wrote 21:23 to make clear what Jesus said. Some people thought Jesus told Peter that John would not die until Jesus returns to earth.However, Jesus did not want Peter to think about this. Peter must follow Jesus, and John must follow Jesus. They should not compare themselves to each other. Each disciple must obey Jesus and do the things he wants them to do.
John is the disciple who wrote this book. John never called himself by his name in this gospel. He did not want to take any attention away from Jesus. John wanted the readers of this gospel to remember Jesus, not John.
John explained in 21:25 that Jesus did many other things. John did not write all these things in his gospel. These other things were amazing things. They were amazing because Jesus did them. But there were so many of them that John could not write all of them down.
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