How do we know that salvation by grace is true?

Salvation by grace is a central tenet of Scripture, underpinned by the clear teaching found in passages such as Ephesians 2:8-9, which declares that we are saved by grace through faith, and that not of ourselves; it is the gift of God. The concept of election, articulated in Romans 11:5, reinforces this doctrine, suggesting that God's choice is not based on human merit but on His sovereign will. Furthermore, the statements attributed to Christ in John 17 concerning those whom the Father has given Him clearly delineate that Christ came to redeem the elect, which underscores the belief that salvation is not a universal offer but rather a specific act toward those whom God has chosen for Himself (Romans 9). As such, the truth of salvation by grace hinges on God's authoritative declarations in Scripture.