Why is having a pure heart important for Christians?

A pure heart is crucial for Christians because it directly impacts their relationship with God. As indicated in Matthew 5:8, only the pure in heart will see God, which symbolizes both present spiritual insight and ultimate communion with Him in eternity. The pure heart comes through the regenerating work of the Holy Spirit; it is not something that the unredeemed human heart can achieve. According to 1 John 3:9, those born of God are incapable of committing sin because they possess a new, pure heart. Therefore, maintaining purity is a reflection of salvation and an assurance of God's ongoing work in believers' lives.