“Let the peace of Christ rule in your hearts, to which indeed you were called in one body. And be thankful. Let the word of Christ dwell in you richly, teaching and admonishing one another in all wisdom, singing psalms and hymns and spiritual songs, with thankfulness in your hearts to God” – If believers want to have a powerful witness and testimony, then they must have the peace that comes from knowing and walking with Christ,  and receiving the wisdom that comes from His Word—both which only come from a regular discipline of prayer, study of the Word and fellowship one with another.