"In a day and age where so many troubles and trials are on every hand, we need to sing a song -- a song with foundation, strength and guidance -- a song of peace and joy about the sovereign God and his love for us." -- Harvey Dockery in the Preface to the 2002 Alabama Christian Harmony
"Heaven is the seat and home of song. It is not strange therefore that the pious on earth, bending their footsteps thither, anticipating their future employment, should give expression to their religious emotions in hymns of praise. Hence, in all ages of the church, the singing of the songs of Zion has constituted an essential part of worship." -- The Psalmody: a Collection of Hymns for Public and Social Worship, published in 1853
"Singing is not a simple heart singing, or mental singing; but a musical melodious modulation, or tuning of the voice. Singing is a duty performed always with the voice, and cannot be done without the tongue." -- Benjamin Keach, The Breach Repaired in God's Worship, or Singing of Psalms, Hymns and Spiritual Songs Proved to be an Holy Ordinance of Jesus Christ, 1691.
"Musick hath Charms to soothe a savage Breast,
To soften Rocks, or bend a knotted Oak."
-- William Congreve, in The Mourning Bride, 1697 [Also from that source, "Heaven has no rage like love to hatred turned, Nor hell a fury like a woman scorned"]