Isaac Watts,
A Short Essay Toward the Improvement of Psalmody
“ And I think it may be as proper in our Churches to read a Sermon of Moses or Isaiah instead of preaching the Gospel, as to sing a Psalm of David whose Expressions chiefly refer to David the Shepherd, the King, the Fugitive, the Captain, the Musician and the Jew. In short the Prayers, Sermons and Songs in Scripture are rather Patterns by which we should frame our Worship and adjust it to our present Case, than Forms of Worship to which we should precisely and unchangeably confine our selves. ”
