Jesus concluded his final discourse with his disciples before his death in John 16:12-33. He developed previous lessons and added that they would have temporary sorrow that would change into lasting joy. In spite of our suffering in this world, Christians can have joy, peace, and courage, because Jesus has overcome the world.
The model described in Colossians 4:2-6 of ministry to those outside the church is very simple: pray, walk, and talk.
Disorderly members can wreck a church, but a firm and loving response by other members can save them and the church.
In some of his last words, in Matthew 28:16-20, Jesus gave a clear mission to his disciples: to make more disciples of all people...