There is a universal principle that must be understood if we want to clearly comprehend the topic of musical instruments in worship. That principle is that we are never to change God’s word.  When God says something we are not to add to it or take away from it.  This has always been the case (Deuteronomy 4:2; 12:32, Proverbs 30:6, Revelation 22:18, 19).  Therefore, as we approach the subject of how we are to sing we notice that God never said He wants instruments in New Testament worship.  He told us to sing and make melody in our hearts (Ephesians 5:19) and to sing with grace in our hearts (Colossians 3:16).  We could read the New Testament through a thousand times and never hear of an instrument in the church.  Therefore, we are not to add it to our worship.