John Calvin on Galatians 3:5

5. He therefore that ministereth. He is not now speaking of the grace of regeneration, but of the other gifts of the Spirit; for a subject different from the preceding one is manifestly introduced. He warns them that all the gifts of the Holy Spirit, in which they excelled, are the fruits of the gospel, of that gospel which had been preached among them by his own lips. Their new teachers deprived them of those gifts when they left the gospel, and fled to another kind of doctrine. In proportion to the value which they attached to those gifts, to which the apostle here adds miracles, they ought the more carefully and resolutely to adhere to the gospel.

Galatians 3:6-9

6. Even as Abraham believed God, and it was accounted to him for righteousness.

6. Quemadmodum Abraham credidit Deo, et imputatum est illi in justitiam. (Genesis 15:6 Romans 4:3 James 2:23.)

7. Know ye therefore, that they which are of faith, the same are the children of Abraham.

7. Cognoscite ergo, quod qui ex fide sunt, ii sunt filii Abrahae.

8. And the scripture, foreseeing that God would justify the heathen through faith, preached before the gospel unto Abraham, saying, In thee shall all nations be blessed.

8. Scriptura autem, quia praevidebat, quod ex fide justificet Deus Gentes, ante evangelizavit Abrahae: In to benedicentur omnes Gentes. (Genesis 22:18.)

9. So then they which be of faith are blessed with faithful Abraham.

9. Itaque qui ex fide sunt, benedicuntur cure fideli Abraham.