God has spoken through four offices, each of which represents a role of Christ (Priest, prophet, judge and king).

The number four represents God's word as revealed through four 'voices'. Since it is two twos, the voices map to four combinations of heaven and earth. If we represent two as H,E, then we map four as HH, HE, EH, EE.

HH Priest

HE Prophet

EH Judge

EE King

         Priest HH
            |
 EH Judge-------Prophet HE
            |
            |
            |
          King EE

2Ti 3:16 All scripture [is] given by inspiration of God, and [is] profitable for doctrine, for reproof, for correction, for instruction in righteousness:

Priest: Correction (he makes thing right)

Prophet: Doctrine (speaks of Christ and him crucified)

Judge: Reproof (confrontation of sin)

King: Training in righteousness (ruling over the flesh)