How can we be sure that Christ's death is effective for salvation?

In the context of sovereign grace theology, the effectiveness of Christ's atonement hinges on the truth that He is God incarnate. Because of His divine nature, every individual for whom He died will inevitably be saved. If Christ’s death was for everyone, then it would contradict His nature and purpose, as not all are saved. Therefore, the assurance we have in salvation comes from the belief that because He died specifically for the many, all His elect will come to faith. This is supported by passages such as Romans 5:6, which states that 'Christ died for the ungodly,' affirming that His sacrifice was intentional and effective for those chosen by God.