How do we know salvation is for everyone?

The doctrine of salvation teaches us that God's grace is sufficient to save everyone, as exemplified by the Apostle Paul's conversion. Despite his intense opposition to the early Christians, God sovereignly intervened to redeem Saul, proving that no one is beyond salvation. Romans 10:13 states, 'For everyone who calls on the name of the Lord will be saved', which reassures us of the universality of God's saving grace. This principle encourages Christians to pray for and reach out to all individuals, as God delights in showing mercy and can renew even the most obstinate hearts.