How do we know that eternal salvation is guaranteed for believers?

The certainty of eternal salvation for believers is anchored in the finished work of Christ. The Apostle Paul explains in Romans 5:1 that being justified by faith grants us peace with God. This not only assures us of our standing before God but also confirms that our salvation is secure in Christ's sacrificial act on our behalf. As we rest in His completed work, we can confidently affirm that no one who comes to Christ will be cast out, as declared in John 6:37. Our assurance is grounded in the reliable promises of God, affirming that we are eternally secure in His grace.