But that the honour which we pay to the Son of God, as well as that which we render to God the Father, consists of an upright course of life, is plainly taught us by the passage, “You that makest your boast of the law, through breaking the law do you dishonour God?” and also, “Of how much sorer punishment, do you suppose, shall he be thought worthy, who has trodden under foot the Son of God, and has counted the blood of the covenant, wherewith he was sanctified, an unholy thing, and has done despite unto the Spirit of grace?” For if he who transgresses the law dishonours God by his transgression, and he who treads under foot the word treads under foot the Son of God, it is evident that he who keeps the law honours God, and that the worshipper of God is he whose life is regulated by the principles and precepts of the divine word.
Had Celsus known who they are who are God's people, and that they alone are wise—and who they are who are strangers to God, and that these are all the wicked who have no desire to give themselves to virtue, he would have considered before he gave expression to the words, “How can he who honours any of those whom God acknowledges as His own be displeasing to God, to whom they all belong?”
Source: Against Celsus (New Advent)