Colossians 4:2-6
2Devote yourselves to prayer, keeping alert in it with an attitude of thanksgiving; 3praying at the same time for us as well, that God will open up to us a door for the word, so that we may speak forth the mystery of Christ, for which I have also been imprisoned; 4that I may make it clear in the way I ought to speak.
5Conduct yourselves with wisdom toward outsiders, making the most of the opportunity. 6Let your speech always be with grace, as though seasoned with salt, so that you will know how you should respond to each person.