Colossians 4:3-6

withal praying also for us, that God would open unto us a door of utterance, to speak the mystery of Christ, for which I am also in bonds: that I may make it manifest, as I ought to speak. Walk in wisdom toward them that are without, redeeming the time. Let your speech be alway with grace, seasoned with salt, that ye may know how ye ought to answer every man.