As the previous two posts demonstrated (see here and here), Patrick Gillespie taught that Christ fulfilled the terms of the Covenant of Redemption in order to establish the gracious character of the Covenant of Grace. While God requires faith as the condition of entering the Covenant of Grace, Christ supplied this condition by purchasing the Holy Spirit for his elect to grant them saving faith (Ark of the Covenant, 309, 404, 415). Christ is the sum of the Covenant of Grace and he is the chief promise of that covenant. Yet it was only possible for Christ to procure the redemption of the elect as their prophet, priest, and king because he was God and man in two distinct natures and one person. In chapter 11 of his work, Gillespie summarizes briefly why Christ had to be God and man in two distinct natures and one person forever. This material is virtually a mirror image of Westminster Larger Catechism 38-40 and, as such, helps explain the context of the Catechism’s teaching on the necessity of Christ’s two natures. While I will not refer to these Catechism question in detail in this post, I recommend that readers look through them in light of Gillespie’s summary in order to help them meditate on Christ’s glory more effectively. This material provides an important component of how Christ fulfilled the Covenant of Redemption and how we could be the Mediator of the Covenant of Grace.