What does the Bible say about the assurance of faith?

The assurance of faith is primarily rooted in the completed work of Jesus Christ as the perfect sacrifice for sin. Hebrews 10:19 states that believers have 'boldness to enter into the holiest by the blood of Jesus.' This signifies that the way to God has been opened for us through Christ, allowing us to approach God with confidence rather than fear. This assurance is not based on our own efforts, but rather on the faithfulness of God and the eternal promises He has made to His people.

Additionally, the passage encourages believers to 'hold fast the profession of our faith without wavering' (Hebrews 10:23) because God is faithful who promised. Our confidence in salvation is not dependent on our performance but on the inviolable nature of God's promises, reinforcing the importance of faith as a gift from God itself. Therefore, the assurance we experience in our faith is a reflection of His grace and our standing in Him.