Here is an excerpt:
What is Definitive Sanctification?
As he unfolded the meaning of definitive sanctification, Murray explained that certain portions of Scriptures, such as Romans 6:1-23, teach that “there is a once-for-all definitive and irreversible breach with the realm in which sin reigns in and unto death,” and “that our death to sin and newness of life are effected in our identification with Christ in his death and resurrection.” In further explaining how union with Christ makes definitive sanctification a reality, Murray wrote:
It is by virtue of our having died with Christ and our being raised with Him in His resurrection from the dead that the decisive breach with sin in its power, control, and defilement had been wrought…Christ in his death and resurrection broke the power of sin, triumphed over the god of this world, the prince of darkness, executed judgment upon the world and its ruler, and by that victory delivered all those who were united to him from the power of darkness and translated them into his own kingdom. So intimate is the union between Christ and his people that they were partakers with him in all these triumphal achievements and therefore died to sin, rose with Christ in the power of his resurrection…