Colossians 4:2-4

2Be persistent and devoted to prayer, being alert and focused in your prayer life with an attitude of thanksgiving.

3At the same time pray for us, too, that God will open a door [of opportunity] to us for the word, to proclaim the mystery of Christ, for which I have been imprisoned;

4that I may make it clear [and speak boldly and unfold the mystery] in the way I should.