Why is it dangerous to mix grace and works?

The danger of mixing grace and works lies in the essential truth that if one adds anything to grace, it no longer remains grace (Romans 11:6). Paul warns in Galatians 5:2-4 that attempting to be justified by the law results in falling from grace, as it suggests that Christ's work was inadequate. When believers rely on their own efforts, they risk losing sight of the sufficiency of Christ's righteousness and create a false gospel that offers no salvation. This confusion leads to apostasy, where individuals may profess faith yet turn back to legalism, rejecting the complete work of Christ in their lives.