…the whole purpose of the grace of God in Jesus Christ is to enable us to fulfill and to keep the righteousness of the law, then we must obviously be clear in our minds as to what the law is, and what is demands of us. We have seen that that is the biblical doctrine of holiness. Holiness is not an experience that we have; it means keeping and fulfilling the law of God. Experiences may help us to do that, but we cannot receive holiness and sanctification as experiences. Holiness is something we practice in our daily life. It is the honoring and the keeping of the law, as the Son of God Himself kept it while He was here on earth. It is being like Him. That is holiness. So you see it is intimately related to the law, and must always be thought of in terms of keeping the law.
D. Martyn Lloyd-Jones, Studies on The Sermon on the Mount, p. 200.