Jesus is concerned to give assurance to those of us who would read the Gospel of John in the 21st century.
For example, he prays for us in John 17:20, “I do not ask for these only, but also for those who will believe in me through their word.” In other words, Jesus foresaw that after his departure everyone who would become a Christian would do so not by seeing his physical body but through “the word” of the eyewitnesses. This is possible because an eyewitness like John wrote the Gospel of John.
Another example is the way Jesus responded to Thomas who needed to see Jesus’ wounds in order to believe he was really raised from the dead...
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