Christ is both fully God and fully man, the one Mediator between God and man (1 Tim. 2:5). His person is essential—only the God-man could save. His work is finished—He lived, died, and rose to redeem His people. Calvin said Christ is “clothed with the gospel” to bring us to God. To drift from sound Christology is to drift from salvation itself. Doctrine keeps our eyes fixed on the true Christ, not a counterfeit.