1. Jesus chose us out of the world (18-25)
As Jesus' disciples, we do not belong to the world. Jesus chose us out of the world. We belong to God, not this world. As such, the world does not love us. In fact, sometimes, it seems the world hates us. The reason is that the world hates Jesus. Jesus was crucified for no other reason than its hatred of him. When we read Acts, we see how much the world hated the apostles as well. They were persecuted severely! The world hates Jesus because he testifies to God and His sovereignty. But the world's hatred fulfills Scripture (Ps 35:19).
2. The Holy Spirit testifies about Jesus (26,27)
Even though we are hated by the world, Jesus gives us the mission to testify about him. Jesus promised to send us the Holy Spirit, the Spirit of truth, to help us. Jesus never stopped testifying to the truth even when the world hated him. We should do likewise.