What does the Bible say about evidence of salvation?

The evidence of salvation is highlighted in 1 Thessalonians 1:6-10, where genuine believers exhibit a deep and abiding faith in the Lord. This faith is not merely intellectual assent but is accompanied by joy from the Holy Spirit, even amidst affliction. The Thessalonian believers turned from their idols to serve the living God, which signifies a radical change in their lives brought about by God's grace. Their endurance through suffering, their proclamation of the gospel, and their community of faith serve as further evidence of their salvation, demonstrating the transformative power of God in the lives of believers.