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Concerning Christian Liberty
We give this rule: the good things which we have from God ought to flow from one to another and become common to all, so that every one of us may, as it were, put on his neighbour, and so behave towards him as if he were himself in his place. They flowed and do flow from Christ to us; He put us on, and acted for us as if He Himself were what we are. From us they flow to those who have need of them; so that my faith and righteousness ought to be laid down before God as a covering and intercession for the sins of my neighbour, which I am to take on myself, and so labour and endure servitude in them, as if they were my own; for thus has Christ done for us. This is true love and the genuine truth of Christian life. But only there is it true and genuine where there is true and genuine faith. Hence the Apostle attributes to charity this quality: that she seeketh not her own.
We conclude therefore that a Christian man does not live in himself, but in Christ and in his neighbour, or else is no Christian: in Christ by faith; in his neighbour by love. By faith he is carried upwards above himself to God, and by love he sinks back below himself to his neighbour, still always-abiding in God and His love, as Christ says, "Verily I say unto you, Hereafter ye shall see heaven open, and the angels of God ascending and descending upon the Son of man" (John i. 51).
Thus much concerning liberty, which, as you see, is a true and spiritual liberty, making our hearts free from all sins, laws, and commandments, as Paul says, "The law is not made for a righteous man" (1 Tim. i. 9), and one which surpasses all other external liberties, as far as heaven is above earth. May Christ make us to understand and preserve this liberty. Amen.
Finally, for the sake of those to whom nothing can be stated so well but that they misunderstand and distort it, we must add a word, in case they can understand even that. There are very many persons who, when they hear of this liberty of faith, straightway turn it into an occasion of licence. They think that everything is now lawful for them, and do not choose to show themselves free men and Christians in any other way than by their contempt and reprehension of ceremonies, of traditions, of human laws; as if they were Christians merely because they refuse to fast on stated days, or eat flesh when others fast, or omit the customary prayers; scoffing at the precepts of men, but utterly passing over all the rest that belongs to the Christian religion. On the other hand, they are most pertinaciously resisted by those who strive after salvation solely by their observance of and reverence for ceremonies, as if they would be saved merely because they fast on stated days, or abstain from flesh, or make formal prayers; talking loudly of the precepts of the Church and of the Fathers, and not caring a straw about those things which belong to our genuine faith. Both these parties are plainly culpable, in that, while they neglect matters which are of weight and necessary for salvation, they contend noisily about such as are without weight and not necessary.