It is indeed true, that we are justified in Christ through the mercy of God alone, but it is equally true and certain, that all who are justified are called by the Lord, that they may live worthy of their vocation. Â Let then the faithful learn to embrace him, not only for justification, but also for sanctification, as he has been given to us for both these purposes, lest they render him asunder by their mutilated faith (Romans 8:13).
As Christ  cannot be torn into parts, so these two which we perceive in him together and conjointly are inseparable – namely, righteousness and sanctification. (Calvin, Institutes, 2.11.6, p. 732)
Calvin provides a helpful reminder that Christ cannot be rent asunder or torn into parts. Â Salvation necessitates that believers are united to the person of Jesus Christ who becomes wisdom and righteousness and sanctification (1 Cor 1:30). Â Salvation comes from Christ who in his totality is the person of salvation. Â Treating any salvific benefit individually to the exclusion of the others is in effect to render him asunder.
I appeal to you, brothers, to watch out for those who cause divisions and create obstacles contrary to the doctrine that you have been taught; avoid them. For such persons do not serve our Lord Christ, but their own appetites, and by smooth talk and flattery they deceive the hearts of the naïve. (Romans 16:17-18)