Nevertheless, many even of the authorities believed in him, but for fear of the Pharisees they did not confess it, so that they would not be put out of the synagogue; for they loved the glory that comes from man more than the glory that comes from God.
(John 12:42-43 ESV)
The following chapter in John marked the final part of Christ's public ministry. All that was needed to be said was said and all that was needed to be done was done. Miracles, sermons, parables, you name it, all of these things were already done to provide the people of Israel a teaser for the glory that is to come. His final act was inching in and yet, we'd still find people who didn't believe.
You might want to ask what did they miss? They had front row seats to see the life of Christ and yet, they still couldn't put the things they've witnessed into a declaration. What hindered them from doing so?