How do we know that God's confirmation is true?

The confirmation believers experience is true because it originates from God's faithfulness, highlighted in passages like Romans 8:30, where Paul reminds us that those whom God foreknew, He also predestined, called, justified, and glorified. The believer’s security is rooted not in their own actions but in the invincible grace provided through Jesus Christ. In Ephesians 1:13, Paul asserts that after hearing the gospel and believing, believers are sealed by the Holy Spirit, which is God's guarantee of their confirmation and security until the end.