Final answer:
Christians share in the kingly aspect of Jesus' threefold mission by living out the values of the kingdom of God, such as justice and service to others, in their daily lives. Through baptism, they are empowered to contribute to the world's transformation, mirroring the authority and dominion of Christ as depicted in the image of Christ Pantokrator. They are considered 'a royal priesthood' and are called to be witnesses to Christ's kingship.
Step-by-step explanation:
The Christian vocation of all the baptised sharing in Jesus' threefold mission today involves the aspect of being a 'king.' This kingly mission is reflected in the life of the Christian community through their call to live out the reign of God in their daily lives. The concept of Christians as kings is rooted in scriptural references, such as 'Ye are a royal priesthood, a holy nation' (I Peter 2:9) and the image of Christ Pantokrator, conveying the authority and dominion of Jesus.
Christians participate in Jesus' kingly mission by striving to embody the values of the kingdom of God, which includes justice, peace, love, and service to others. They believe that through their baptism, they are anointed and empowered to contribute to the transformation of the world in alignment with Christian principles. The lay faithful are called to exercise this kingly ministry in their personal, familial, professional, and social lives, encouraging a pure spiritual Christianity and civil liberty.
Moreover, in the New Testament, Jesus is referred to as 'the Christ,' meaning the anointed one or savior. His life, death, and resurrection established the possibility of redemption and eternal life, thereby instituting the kingdom of God. Each baptized Christian, then, shares in this mission to spread the message of salvation and live as witnesses to Christ's kingship in the world.