Glory to God alone (soli Deo gloria) expressed the Reformers' insistence that no human figure, institution, or act should share in the honor due to God for salvation. This was partly a protest against the veneration of saints and the papal claim to spiritual authority, but more fundamentally a corollary of sola gratia: if God alone saves, then God alone deserves the glory for it. The principle shaped Reformation worship (stripping ornament that might distract from God's word), theology (rejecting human merit), and ecclesiology (rejecting papal authority as competing with Christ's headship).
"The end of the death of Christ is either supreme and ultimate, or intermediate and subservient to that last end. The first is the glory of God, or the manifestation of his glorious attributes, especially of his justice, and mercy tempered with justice, unto us" — Owen on Christ's atonement as supremely designed to manifest God's glory, the divine attributes of justice and mercy together constituting the ultimate end of the entire redemptive plan.
"Should they begin to estimate it by their good works, nothing will be weaker or more uncertain; works, when estimated by themselves, no less proving the divine displeasure by their imperfection, than his good-will by their incipient purity" — Calvin on why gratuitous justification by faith alone preserves God's exclusive glory: works-based confidence is too weak to sustain assurance and implicitly robs God of the honor due to his unmerited promise.
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