The prophet declares a truth by which we may test all doctrine. He says, “To the law and to the testimony: if they speak not according to this word, it is because there is no light in them” (Isaiah 8:20). Although error abounds in the world, there is no reason why men need remain in deception. The truth is plain, and when it is contrasted with error, its character may be discerned. All the subjects of God's grace may understand what is required of them. By faith we may conform our lives to the standard of righteousness, because we can appropriate to ourselves the righteousness of Christ. FW 97.1
In the Word of God the honest seeker for truth will find the rule for genuine sanctification. The apostle says: “There is therefore now no condemnation to them which are in Christ Jesus, who walk not after the flesh, but after the Spirit.... For what the law could not do, in that it was weak through the flesh, God sending His own Son in the likeness of sinful flesh, and for sin, condemned sin in the flesh; that the righteousness of the law might be fulfilled in us, who walk not after the flesh, but after the Spirit. For they that are after the flesh do mind the things of the flesh; but they that are after the Spirit the things of the Spirit. For to be carnally minded is death; but to be spiritually minded is life and peace. Because the carnal mind is enmity against God: for it is not subject to the law of God, neither indeed can be. So then they that are in the flesh cannot please God. But ye are not in the flesh, but in the Spirit, if so be that the Spirit of God dwell in you” (Romans 8:1-9). FW 97.2