How do we know that Christ's sacrifice was for the elect?

The concept of Christ as the Lamb slain from the foundation of the world emphasizes that His sacrifice was preordained for a specific purpose. Revelation 13:8 encapsulates this truth, indicating that Christ's atonement was predetermined and efficacious for those whose names are written in the Lamb's Book of Life. This assertion is further supported by 1 Peter 1:18-20, which identifies Jesus as 'foreknown before the foundation of the world,' affirming that His sacrifice was not a reaction to sin but a premeditated act of grace designed for the redemption of His chosen people. In this light, every believer can have confidence in the effectual nature of Christ's atonement, knowing it was intended for them as part of God's sovereign plan.