How do we know Christ's death secured salvation for His people?

The certainty of salvation through Christ's death is directly connected to the atonement He provided. Romans 8:28-30 reveals that those whom God foreknew He predestined to be conformed to the image of His Son; this indicates a definite plan that includes the redemptive work of Christ. If Christ did not secure the redemption of those for whom He died, we would lack a confident message of salvation. Instead, Scripture assures us of the effectiveness of His sacrifice, indicating that He shall indeed save His people from their sins. Thus, the truth of Christ's accomplished redemption is central to the historic Reformed understanding of salvation.