It is written (Mt 4, 10)—indeed, it is the first commandment—"Thou shalt worship the Lord thy God, and him only shalt thou serve." There Christ requires of us, under the penalty of forfeiting eternal life, to honor him as our Lord and so to regulate our lives that we shall know we serve him. Peter also teaches (1 Pet 4, 11) that all the Christian's words and deeds should be regarded not as his own, but as God's. The word and the act are to be of the ability which God gives, that in it all God may be glorified. Of necessity this condition can obtain only through the Holy Spirit.
27. In this point—the glorification of Christ—do the true Christians distinguish themselves from false Christians, hypocrites and factious spirits, who likewise triumphantly boast of the Spirit and of their divine office. But the vanity of their boasting is evident from the fact that they do not hold to the doctrine that glorifies Christ, but preach that which leads to other evils and deceives; yes, which condemns and persecutes the right doctrine and the true faith of Christ. Further evidence of the emptiness of their boasting is apparent in the fact that they have no conscious testimony that they serve Christ, nor can their followers give assurance on the same point. You have here the clear sentence of Paul declaring this class devoid of the Holy Spirit and thus separated from the true Church and from Christians. He exhorts us to be on our guard against them, and would bring Christians together in one faith and under one Lord and Spirit. Now he teaches how to employ rightly the manifold gifts of a united Church for the general benefit of its members.
"Now there are diversities of gifts, but the same Spirit."
28. "In former time, when you were heathen, you followed many kinds of idolatrous worship, many doctrines and spirits; but it was only a divided religion, and representative of blindness and error. Now, however, you possess various beautiful divine gifts and offices. These are mutually related and all emanate, not from man's reason or faculties, but from the one true God. They are his work—the expression of his power. Notwithstanding the dissimilarity of gifts, offices and works, of a certain order in one and otherwise in another, many and few, great and small, weak and strong—notwithstanding all, we are not to divide the Spirit, God and faith; we are not to create factions, exalting this individual or that one solely because of his gifts, and despising others. All gifts are direct from one God, one Lord, one Spirit, and to serve the same purpose—to bring men to the knowledge of the one God and to build up the Church in the unity of faith. Therefore, you are united in the one doctrine, your object being to serve God and the Church in a harmonious way." This verse is briefly the substance of all that follows in the text.