In his 1973 article “Towards a Confession for Tomorrow’s Church,” J.I. Packer insisted that historic creeds and confessions assist the church in carrying out four principal responsibilities—its doxological, declarative, didactic, and disciplinary tasks. Accordingly, churches should make use of these historical doctrinal statements in their worship (doxological), witness (declarative), teaching (didactic), and conservation (disciplinary). Packer proceeded to define how they function in each task:
Their doxological function is to glorify God by setting forth his works of love and putting into words a responsive commitment. Their declarative function is to announce what the communities that espouse them stand for, and so to identify those communities as belonging to Christ’s church, the worldwide fellowship of faith. Their didactic function is to serve as a basis for instruction. Their disciplinary function is to establish the limits of belief within which each confessing body wishes to stay, and so to lay a foundation for whatever forms of doctrinal restriction or direction it may see fit to impose on its clerical and lay members.
The doxological task is the most extensive, since worship involves elements of the declarative, didactic, and disciplinary tasks. Historic creeds and confessions aid the gathered assembly of believers in declaring the core truths of Scripture. They serve the didactic assignment by offering ministers refined doctrinal formulations that assist them in rightly teaching and preaching the whole counsel of God from Scripture. They function as a disciplinary guide, giving leaders and members a doctrinal standard with which to hold one another accountable. Their clear doctrinal definitions act as guardrails to safeguard what is taught and proclaimed in the context of worship. As Packer explained:
Without authorized doctrinal formulae (standards, as Presbyterians have historically called them) the church is clearly at a disadvantage for maintaining its character as “the pillar and bulwark of the truth” (1 Tim. 3:15). Granted, no human formula of faith is complete or final; yet formularies can be true as far as they go, and very useful for excluding false trails and helping each generation to fulfil the task of making as clear as possible what Christianity really is.
When Christians publicly confess the truths that the church has always confessed, God is distinguishing between the church and the world—as well as between true and false churches. Historic doctrinal standards help draw a sharp line between orthodox teaching and false teaching in the articulation of “the faith that was once for all delivered to the saints” (Jude 3).