After telling his disciples that they should love one another, Jesus began preparing them in John 15:18-16:11 to be hated by the world. Even so, he sent them out to be witnesses for him, but not on their own. He also promised to send the Holy Spirit to be the witness who would convince the world about the truth of the gospel.
While the Old Testament is still valid, we also have the message of the one who was raised from the dead.
God grows his church usually by ordinary and sometimes extraordinary means.
Because God's power is greater than ours, we ought to obey God, knowing that the joy he gives is greater than suffering humans can...