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Concerning Christian Liberty
Who then can value highly enough these royal nuptials? Who can comprehend the riches of the glory of this grace? Christ, that rich and pious Husband, takes as a wife a needy and impious harlot, redeeming her from all her evils and supplying her with all His good things. It is impossible now that her sins should destroy her, since they have been laid upon Christ and swallowed up in Him, and since she has in her Husband Christ a righteousness which she may claim as her own, and which she can set up with confidence against all her sins, against death and hell, saying, "If I have sinned, my Christ, in whom I believe, has not sinned; all mine is His, and all His is mine," as it is written, "My beloved is mine, and I am His" (Cant. ii. 16). This is what Paul says: "Thanks be to God, which giveth us the victory through our Lord Jesus Christ," victory over sin and death, as he says, "The sting of death is sin, and the strength of sin is the law" (1 Cor. xv. 56, 57).
From all this you will again understand why so much importance is attributed to faith, so that it alone can fulfil the law and justify without any works. For you see that the First Commandment, which says, "Thou shalt worship one God only," is fulfilled by faith alone. If you were nothing but good works from the soles of your feet to the crown of your head, you would not be worshipping God, nor fulfilling the First Commandment, since it is impossible to worship God without ascribing to Him the glory of truth and of universal goodness, as it ought in truth to be ascribed. Now this is not done by works, but only by faith of heart. It is not by working, but by believing, that we glorify God, and confess Him to be true. On this ground faith alone is the righteousness of a Christian man, and the fulfilling of all the commandments. For to him who fulfils the first the task of fulfilling all the rest is easy.
Works, since they are irrational things, cannot glorify God, although they may be done to the glory of God, if faith be present. But at present we are inquiring, not into the quality of the works done, but into him who does them, who glorifies God, and brings forth good works. This is faith of heart, the head and the substance of all our righteousness. Hence that is a blind and perilous doctrine which teaches that the commandments are fulfilled by works. The commandments must have been fulfilled previous to any good works, and good works follow their fulfillment, as we shall see.
But, that we may have a wider view of that grace which our inner man has in Christ, we must know that in the Old Testament God sanctified to Himself every first-born male. The birthright was of great value, giving a superiority over the rest by the double honour of priesthood and kingship. For the first-born brother was priest and lord of all the rest.