We know we are part of God's elect by faith in Christ and the work of the Holy Spirit in our lives.
The assurance of being part of God's elect comes through faith in Christ and the evidence of a transformed life. Romans 8:28-30 assures us that 'whom he did predestinate, them he also called: and whom he called, them he also justified: and whom he justified, them he also glorified.' This chain of salvation emphasizes God's sovereign action in our lives. Moreover, the Holy Spirit's work in us creates a desire to follow Christ and turn away from sin, affirming that we are His chosen people. It is by grace alone that we come to know this profound truth.
Scripture References:
Romans 8:28-30, John 6:68-69, Romans 8:30
Commentary