John Chrysostom
The expression “after this” means nothing other than that, for the sake of brevity, the Evangelist omitted much time that had passed between the two events.
This is clear from the fact that, when Christ sat on the mountain, it was the Feast of Passover, Jn 6:3-4. Now the Evangelist mentions the Feast of Tabernacles.
Thus, from the events of five months, he told us nothing else and transmitted nothing other than the miracle of the loaves and the discourse to the people who had eaten the loaves.
Yet Christ constantly worked miracles and spoke not only by day and evening, but often also by night. For example, according to all the Evangelists, He appeared to the disciples at night.
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Why, then, did they omit those events? Because it was impossible to recount everything. Moreover, they especially tried to speak about matters from which some blame or contradiction might arise on the part of the Jews.
There were many events like those that were omitted. Therefore the Evangelists, after writing many times that Christ healed the sick, raised the dead, and stirred up wonder, sometimes pass over such things in silence.
But when they had to speak of something unusual, or to recount something that might seem to serve as reproach against Him, they narrated it. Thus even now the Evangelist notes that His brothers did not believe in Him, though this circumstance contains no small reproach against Him.
Truly worthy of wonder is the Evangelists’ love of truth. They are not ashamed to speak of what seems to serve as reproach against the Teacher. They even strive to narrate this more than anything else.
Therefore John, after passing over in silence many signs, miracles, and discourses of Christ, immediately proceeds to what follows.