How do we know Jesus is our representative in salvation?

In Romans 5, Paul draws a parallel between Adam and Christ, indicating that just as sin and death entered the world through Adam, salvation and life come through Christ. Christ is referred to as the 'second Adam' who represents a new humanity. While Adam's sin led to condemnation for all, Christ's obedience and sacrificial death lead to justification and eternal life for all whom the Father has given Him.

This representational aspect is crucial to Reformed theology, affirming that Christ acts as the perfect federal head for His people. Just as we were represented by Adam in our fall, we are now represented by Christ in our salvation. This union with Christ is grounded in God's electing grace, signifying that those who believe in Him can be assured of their justification and righteousness. This assures believers that their salvation is not based on their works but on the righteous work of Christ. Thus, the assurance of salvation is beautifully tied to the concept of representation, where believers find their identity and hope in the steadfastness of Christ's redemptive work.