Romans 12:6

Having then gifts differing according to the grace that is given to us; or, seeing we have different gifts and offices, according as the grace of God hath bestowed them upon us, let us use them aright. This is added to prevent pride and envy: none should be proud of that he hath himself or envy what another hath, seeing all is of grace. Whether prophecy, let us prophesy; the words, let us prophesy, are not in the text; but they are put in by our translators, to fill up the sense. There is an ellipsis in the words, and something must be inserted. Some make the supply from the last words in the foregoing verse: Let us be one another's members in prophesying, teaching, exhorting, &c. Others think it ought to be supplied out of Romans 12:3: q.d. Whether we have prophecy, let us be wise unto sobriety in prophesying; and so in all the rest that follow: in all the several gifts and offices, he showeth how they should behave themselves. The Greek scholiast will have supplied in them all, let us persevere. By prophesying, in this place, you may understand an extraordinary gift that some had in understanding Divine mysteries and Old Testament prophecies, with a wonderful dexterity in applying the same; to which was joined sometimes the revelation of secret and future things: see Acts 11:27, Acts 21:9. According to the proportion of faith; i.e. they that have this gift of prophesying, must exercise it according to the measure of knowledge, in heavenly mysteries, that God hath given them; or else, in their prophesying they must have regard to the articles of Christian faith, and see that they regulate themselves according thereunto. Some think he calls the Holy Scripture in general, an analogy or proportion of faith; by these, the false prophets of old were discerned, if they delivered anything contrary thereunto, Deuteronomy 13:1, &c. Others think he speaks of certain principles, or heads of Christian religion, see Hebrews 6:1 from which the prophets and others were not to swerve; yea, some think he aims at the symbol and creed, called the Apostles, which, from the beginning, was called the analogy of faith.