How do we know that purity of heart is achievable?

The Bible reassures believers that purity of heart is indeed possible through the work of Jesus Christ. In 1 John 1:9, it states, 'If we confess our sins, he is faithful and just to forgive us our sins and to cleanse us from all unrighteousness.' This means that acknowledging our sinful state and turning to Christ in faith enables us to receive His grace and forgiveness. Additionally, Ezekiel 36:25-26 speaks of the promise where God says He will give His people a new heart and put a new spirit within them, symbolizing the transformative power of His grace. Therefore, through faith in Christ's sacrifice and the indwelling of the Holy Spirit, Christians can attain and maintain a pure heart.