1 John 1:6

6If we say It is, indeed, an argument from what is inconsistent, when he concludes that they are alienated from God, who walk in darkness. This doctrine, however, depends on a higher principle, that God sanctifies all who are his. For it is not a naked precept that he gives, which requires that our life should be holy; but he rather shews that the grace of Christ serves for this end to dissipate darkness, and to kindle in us the light of God; as though he had said, “What God communicates to us is not a vain fiction; for it is necessary that the power and effect of this fellowship should shine forth in our life; otherwise the possession of the gospel is fallacious.” What he adds, and do not the truth, is the same as if he had said, “We do not act truthfully. We do not regard what is true and right.” And this mode of speaking, as I have before observed, is frequently used by him.