17 For therein is the righteousness of God revealed from faith to faith: as it is written, The just shall live by faith.
English Standard Version
17 For in it the righteousness of God is revealed from faith for faith,Or beginning and ending in faith as it is written, "The righteous shall live by faith."Or The one who by faith is righteous shall live
17 God's way of putting people right shows up in the acts of faith, confirming what Scripture has said all along: "The person in right standing before God by trusting him really lives." Ignoring God Leads to a Downward Spiral
New King James Version
17 For in it the righteousness of God is revealed from faith to faith; as it is written, "The just shall live by faith." Habakkuk 2:4
New Living Translation
17 This Good News tells us how God makes us right in his sight. This is accomplished from start to finish by faith. As the Scriptures say, "It is through faith that a righteous person has life."
In these verses the apostle opens the design of the whole epistle, in which he brings forward a charge of sinfulness against all flesh; declares the only method of deliverance from condemnation, by faith in the mercy of God, through Jesus Christ; and then builds upon it purity of heart, grateful obedience, and earnest desires to improve in all those Christian graces and tempers, which nothing but a lively faith in Christ can bring forth. God is a just and holy God, and we are guilty sinners. It is necessary that we have a righteousness to appear in before him: there is such a righteousness brought in by the Messiah, and made known in the gospel; a gracious method of acceptance, notwithstanding the guilt of our sins. It is the righteousness of Christ, who is God, coming from a satisfaction of infinite value. Faith is all in all, both in the beginning and progress of Christian life. It is not from faith to works, as if faith put us into a justified state, and then works kept us in it; but it is all along from faith to faith; it is faith pressing forward, and gaining the victory over unbelief.