"The righteousness of Jesus Christ ever remains the exclusive ground of the believer’s justification, but the personal godliness of the believer is also necessary for his justification in the judgment of the last day."
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This comes from "Thirty-four Theses on Justification in Relation to Faith, Repentance, and Good Works" presented by Norman Shepherd to the Presbytery of Philadelphia of the Orthodox Presbyterian Church, November 18, 1978.