Jesus tells the disciples they are going to be hated, and that He is about to go away and what it all means: John 15:18–17:26

Jesus had already talked about the unforgiveable sin, and now expanded that to the world’s refusal to believe.

^{John 16:8-11} And when [the Holy Spirit] comes, he will convict the world of its sin, and of God’s righteousness, and of the coming judgment. The world’s sin is that it refuses to believe in me. Righteousness is available because I go to the Father, and you will see me no more.

But why will judgement come? Because it has already come on the ruler of this world: Satan.

^{John 16:11} Judgment will come because the ruler of this world has already been judged.