Why is being part of a royal priesthood important for Christians?

The concept of believers being a 'royal priesthood' as stated in 1 Peter 2:9 underscores the privilege and responsibility Christians have as representatives of God on earth. This designation means that every believer has a role in mediating between God and the world, much like the Old Testament priests but with the significant difference that through Christ, all believers are priests. This access allows believers to approach God directly in prayer and worship, and to offer spiritual sacrifices such as praise, good deeds, and a life lived in holiness (Romans 12:1). The priestly role demonstrates the intimate relationship believers have with God, as well as their calling to serve and equip the church.