What is dispensational truth?
It is the body of truth, doctrine and practice, that is for a particular household of God. Some dispensational truth may be common to both dispensations. Some truth may be peculiar to its own particular dispensation. For instance, citizenship in the heavenly places is peculiar to the dispensation of the mystery. On the other hand, a part in the new Jerusalem is peculiar to the dispensation of promise. The word chosen is common to both, but time of choosing makes the distinction. The choice of some is before the overthrow, and the choice of others since the overthrow. This is where the workmanship of right division comes in.