Why is assurance in salvation important for Christians?

Assurance in salvation is vital for a believer's spiritual well-being, as it fosters confidence and peace in their relationship with God. The Scriptures encourage believers to have a firm assurance based on the work of Christ, rather than their own changing feelings or performance. Hebrews 10:19-22 reminds us that we can draw near to God with full assurance of faith, knowing that Christ's sacrifice has secured our acceptance. This assurance allows us to fight against doubt and fear, reinforcing our trust in God's promises and His faithfulness to save those who rely upon Him completely.