How do we know Christ's atonement is effective for the elect?

The effectiveness of Christ's atonement for the elect is rooted in the belief that He represents them before God. Hebrews 9:26 states, 'He appeared to put away sin by the sacrifice of Himself.' This means that Christ's death was not a general sacrifice but an intentional act meant specifically for His chosen people. His sacrificial death ensures that all their sins are atoned for, allowing them to stand justified before God. Moreover, Romans 8:33 assures us that 'It is God that justifies,' which reinforces that the salvation and security of the elect are guaranteed through Christ's finished work. Thus, the atonement is both particular and effective, securing the salvation of those chosen by God.