“We share one bundle of life with Christ in what He has done. 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 for all’; ‘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!
We miss the radical nature of Paul’s teaching here to our great loss.
So startling is it that we need to find a startling manner of expressing it. For what Paul is saying is that sanctification means this: in relationship to sin and to God, the determining factor of my existence is no longer my past. It is Christ’s past.
The basic framework for my new existence in Christ is that I have become a ‘dead man brought to life’ and must think of myself in those terms: dead to sin and alive to God in union with Jesus Christ our Lord.”
–Sinclair Ferguson, “Christian Spirituality: The Reformed View of Sanctification,” in Some Pastors and Teachers (Carlisle, PA: Banner of Truth, 2017), 533.