‘ “Be filled with the Spirit, speaking to yourselves in psalms and hymns and spiritual songs, singing and making melody in your heart to the Lord.” Eph. 5:18-19. Paul says, “I will sing with (or in) the Spirit, and I will sing with the understanding also.” 1 Cor 14:15. Here is spiritual, Holy Spirit singing. It is the outflow of the Spirit-filled experience. It is “to the Lord.” Not to the audience, but to the Lord. What room is there here for the unconvertedto participate? How can the “world” receive the Spirit and function as a member of the body of Christ, as that body unites in singing God’s praises? It is a violation and a desecretation of the holy place for the unconverted to stand on the sacred rostrum for ministry in word or song. Let the high praises of God be in our mouths. “Bless the Lord, O my soul; and all that is within me, bless His holy name.” Psalm 103:1. How better can we praise our God than with the Spirit of Praise whom He has given us? All who are filled with the Spirit should yield to the Spirit of Praise and submit themselves one to another in the fear of God as together they speak to themselves in psalms and hymns and spiritual songs, singing and making melody in their hearts to the Lord. Eph. 5:19, 21. This is the Bible’s emphasis on Spirit-filled congregational singing. Let us beware lest our so-called “special” singing degenerate into a carnal display of human talents or purely natural entertainment.’
Source: Ralph M. Riggs, The Spirit Himself (1949), Chapter 24: The Holy Spirit in the Church-Local , p. 179-180.