Now that we have briefly reviewed the offices of Christ, let’s look at how those reflect on doctrine.
All three of the offices are common to Christs mediatory function, and in both His humiliated and exalted states. They are central to the person of Christ, and any doctrinal position that denies any of the offices can be deemed incomplete.
In sharing the Gospel, it is important that we not only share the hope that foundational to the Gospel, but also why it is reliable. The mediation of Christ is the basis of our hope, and while it may be too much for an inital Gospel thrust, we must ensure that the underlying knowledge is solid.
The only way we can trust the atonement work done by Christ as priest, is to rely on His credibility established by His prophetic office. And the only way we can trust His assurance that He will execute on His promises, is to believe in His sovereignity as king.
Doctrine that deny any of the three, or even parts of the three, is incomplete, and at worst, a false gospel. The most common denial is of the office of king, that demands citizenship of God’s kingdom, and the recognition of Christ as king. We also see a denial of the priestly office, in which the atonement is recognized through repentance. An absence of repentance denies the cleansing work done by Christ’s sacrifice.
In summary, Christ as mediator is not something that can be simplified or normalized, it is a combination of prophesy, teaching, sacrifice and sovereign rule. Without full belief and fatih in each of those, salvation stands incomplete.