He lives to God
All that he has accomplished for us in our human nature is, through union with him, true for us and, in a sense, of us. He died to sin once; he lives to God (Romans 6:10). He came under the dominion of sin in death, but death could not master him. He rose and broke the power of both sin and death. Now he lives forever in resurrection life to God. The same is as true of us as if we had been with him on the cross, in the tomb and on the resurrection morning!
Sinclair Ferguson, "The Reformed View", in Donald Alexander, ed., Christian Spirituality: Five Views on Sanctification (Downers Grove, IL: IVP Academic, 1988), 57