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5. The reading of the Scriptures with godly fear, the sound preaching, and conscionable hearing of the Word, in obedience unto God, with understanding, faith, and reverence; singing of psalms with grace in heart; as also the due administration and worthy receiving of the sacraments instituted by Christ, are all parts of the ordinary religious worship of God: besides religious oaths, vows solemn fastings, and thanksgivings upon special occasions, which are, in their several times and seasons, to be used in a holy and religious manner.
Another element of true worship is the "signing of psalms with grace in the heart." It will be observed that the Confession does not acknowledge the legitimacy of the use of modern hymns in the worship of God, but rather only the psalms of the Old Testament. It is not generally realized today that Presbyterian (and many other Reformed) churches originally used only the inspired psalms, hymns and songs of the biblical Psalter in divine worship, but such is the case. The Westminster Assembly not only expressed the conviction that the psalms should be sung in divine worship, but implemented it by preparing a metrical version of the Psalter for use in the churches. This is not the place to attempt a consideration of this question. But we must record our conviction that the Confession is correct at this point. It is correct, we believe, because it has never been proved that God has commanded his Church to sing the uninspired compositions of men rather than or along with the inspired songs, hymns, and psalms of the Psalter in divine worship.
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G.I. Williamson