How do we know that assurance of salvation is true?

Assurance of salvation is grounded in the belief that it is God, not man, who initiates and secures redemption. According to Romans 8:1, there is no condemnation for those who are in Christ Jesus. This reflects that because Christ took upon Himself our sins, believers can have full confidence of salvation. Furthermore, as Philippians 3:3 states, we worship God in spirit and have no confidence in the flesh, indicating that our faith should not rest on our works but on Christ's completed work. The assurance comes from the Spirit's testimony within us (1 John 5:10), which confirms our status as children of God, offering profound comfort and encouragement.