The 21 Day Journey through the Gospel of John

Answers

To go to Judea so that Jesus’ disciples could see his miracles.
"His time has not yet come."
It seems as if Jesus was living life according to a time-table that even his own brothers could not alter. God is setting Jesus’ agenda.
"My teaching is not from me, but from the one who sent me."
Yes, because the things that he says are about important topics.
If indeed God is speaking, the message being communicated is very important.
Back to the one who sent him, God who is in Heaven.
Not at all, they mock the officers.
The officers, because they heard Jesus speak. Also, Nicodemus had personally interacted with Jesus. The others were making a judgment about Jesus before they would even listen to what he had to say.
Yes, absolutely.