Seeing it is one God - επιπερ εις ο θεος. This has been rendered, Seeing God is one. It however makes little difference in the sense: the apostle's meaning most evidently is, it is one and the same God who made both Jews and Gentiles, who shall justify - pardon, the circumcision - the believing Jews, by faith; and the uncircumcision - the believing Gentiles, by the same faith; as there is but one Savior and one atonement provided for the whole.

It is fanciful to suppose that the apostle has one meaning when he says, εκ πιστεως, By faith, and a different meaning when he says, δια της πιστεως, Through faith. Both the prepositions are to be understood in precisely the same sense; only the addition of the article της, in the last case, extends and more pointedly ascertains the meaning. It is one and the same God who shall justify the believing Jews by faith; and the believing Gentiles δια της πιστεως, by That Same faith.

Romans 3:28 Therefore we conclude that a man is justified by faith without the deeds of the law.

Romans 4:11,12 And he received the sign of circumcision, a seal of the righteousness of the faith which he had yet being uncircumcised...

Romans 10:12,13 For there is no difference between the Jew and the Greek: for the same Lord over all is rich to all that call on him...

Galatians 2:14-16 But when I saw that they walked not uprightly according to the truth of the gospel, I said to Peter before them all, If you, being a Jew...

Galatians 3:8,20,28 And the scripture, foreseeing that God would justify the heathen through faith, preached before the gospel to Abraham, saying...

Galatians 5:6 For in Jesus Christ neither circumcision avails any thing, nor uncircumcision; but faith which works by love.

Galatians 6:15 For in Christ Jesus neither circumcision avails any thing, nor uncircumcision, but a new creature.

Philippians 3:3 For we are the circumcision, which worship God in the spirit, and rejoice in Christ Jesus, and have no confidence in the flesh.

Colossians 2:10,11 And you are complete in him, which is the head of all principality and power...

Justice Satisfied
WHEN THE SOUL is seriously impressed with the conviction of its guilt, when terror and alarm get hold upon it concerning the inevitable consequences of its sin, the soul is afraid of God. It dreads at that time every attribute of divinity. But most of all the sinner is afraid of God's justice. "Ah," saith he to himself, "God is a just God; and if so, how can he pardon my sins? for my iniquities cry aloud for punishment, and my transgressions demand that his right hand should smite me low. How can …
Charles Haddon Spurgeon—Spurgeon's Sermons Volume 5: 1859

A Great Deal for Me to Read Hast Thou Sent...
1. A great deal for me to read hast thou sent, my dearest brother Consentius: a great deal for me to read: to the which while I am preparing an answer, and am drawn off first by one, then by another, more urgent occupation, the year has measured out its course, and has thrust me into such straits, that I must answer in what sort I may, lest the time for sailing being now favorable, and the bearer desirous to return, I should too long detain him. Having therefore unrolled and read through all that …
St. Augustine—Against Lying

Nuremberg Sept. 15, 1530. To the Honorable and Worthy N. , My Favorite Lord and Friend.
Grace and peace in Christ, honorable, worthy and dear Lord and friend. I received your writing with the two questions or queries requesting my response. In the first place, you ask why I, in the 3rd chapter of Romans, translated the words of St. Paul: "Arbitramur hominem iustificari ex fide absque operibus" as "We hold that the human will be justified without the works of the law but only by faith." You also tell me that the Papists are causing a great fuss because St. Paul's text does not contain …
Dr. Martin Luther—An Open Letter on Translating