“And pray for us, too, that God may open a door for our message, so that we may proclaim the mystery of Christ, for which I am in chains. Pray that I may proclaim it clearly, as I should” (Colossians 3:3-4)
Paul was in prison at the time he wrote this letter. He was there not as a murderer, thief or criminal but on the account of the gospel. Satan stirred up so much trouble for him (II Corinthians 12:7) that eventually it landed him in prison under guard. Yet it did nothing to stop the message from going out; if anything it advanced kingdom work.
This is why Paul pauses in the middle of instructions on how to pray (vs. 2) and asked for prayer himself. Because for his mission to succeed in prison he needed the power of prayer. His task was so great that these were the things he asked of them. Pray for an open door to share the gospel. Pray for the boldness to proclaim Jesus as the savior, and pray for the message to be clear and understandable.