romans 1:17 For therein is the righteousness of God revealed from faith to faith: as it is written, The just shall live by faith. - Free Bible Online

      17. For therein is the righteousness of God revealed--that is (as the whole argument of the Epistle shows), GOD'S JUSTIFYING RIGHTEOUSNESS.
      from faith to faith--a difficult clause. Most interpreters (judging from the sense of such phrases elsewhere) take it to mean, "from one degree of faith to another." But this agrees ill with the apostle's design, which has nothing to do with the progressive stages of faith, but solely with faith itself as the appointed way of receiving God's "righteousness." We prefer, therefore, to understand it thus: "The righteousness of God is in the gospel message, revealed (to be) from (or 'by') faith to (or 'for') faith," that is, "in order to be by faith received." (So substantially, MELVILLE, MEYER, STUART, BLOOMFIELD, &c.).
      as it is written-- (Hab 2:4).
      The just shall live by faith--This golden maxim of the Old Testament is thrice quoted in the New Testament--here; Ga 3:11; Heb 10:38 --showing that the gospel way of "LIFE BY FAITH," so far from disturbing, only continued and developed the ancient method.

      On the foregoing verses, Note (1) What manner of persons ought the ministers of Christ to be, according to the pattern here set up: absolutely subject and officially dedicated to the Lord Jesus; separated unto the gospel of God, which contemplates the subjugation of all nations to the faith of Christ: debtors to all classes, the refined and the rude, to bring the gospel to them all alike, all shame in the presence of the one, as well as pride before the other, sinking before the glory which they feel to be in their message; yearning over all faithful churches, not lording it over them, but rejoicing in their prosperity, and finding refreshment and strength in their fellowship! (2) The peculiar features of the gospel here brought prominently forward should be the devout study of all who preach it, and guide the views and the taste of all who are privileged statedly to hear it: that it is "the gospel of God," as a message from heaven, yet not absolutely new, but on the contrary, only the fulfilment of Old Testament promise, that not only is Christ the great theme of it, but Christ in the very nature of God as His own Son, and in the nature of men as partaker of their flesh--the Son of God now in resurrection--power and invested with authority to dispense all grace to men, and all gifts for the establishment and edification of the Church, Christ the righteousness provided of God for the justification of all that believe in His name; and that in this glorious Gospel, when preached as such, there resides the very power of God to save Jew and Gentile alike who embrace it. (3) While Christ is to be regarded as the ordained Channel of all grace from God to men (Ro 1:8), let none imagine that His proper divinity is in any respect compromised by this arrangement, since He is here expressly associated with "God the Father," in prayer for "grace and peace" (including all spiritual blessings) to rest upon this Church (Ro 1:7). (4) While this Epistle teaches, in conformity with the teaching of our Lord Himself, that all salvation is suspended upon faith, this is but half a truth, and will certainly minister to self-righteousness, if dissociated from another feature of the same truth, here explicitly taught, that this faith in God's own gift--for which accordingly in the case of the Roman believers, he "thanks his God through Jesus Christ" (Ro 1:8). (5) Christian fellowship, as indeed all real fellowship, is a mutual benefit; and as it is not possible for the most eminent saints and servants of Christ to impart any refreshment and profit to the meanest of their brethren without experiencing a rich return into their bosoms, so just in proportion to their humility and love will they feel their need of it and rejoice in it.

JFB.