“In a sense Paul treats the argument of this epistle in every word. He has nothing in his mouth but Christ.
Therefore in every word there is a fervor of spirit and life. Note how precisely he speaks.
He does not say: “Who has received our works from us” or “Who has received the sacrifices required by the Law of Moses—acts of worship, monastic orders, Masses, vows, and pilgrimages.”
Instead, he says: “Who has given.” Has given what? Neither gold nor silver nor cattle nor Passover lambs nor an angel, but “Himself.”
For what? Neither for a crown nor for a kingdom nor for our holiness or righteousness, but “for our sins.”
These words are a veritable thunderbolt from heaven against every kind of righteousness, as is the statement (John 1:29): “Behold, the Lamb of God, who takes away the sin of the world!”
Therefore we must pay careful attention to every word and not look at it casually or pass over it lightly; for these words are filled with comfort, and they give great encouragement to timid consciences.”
–Martin Luther, Luther’s Works, Vol. 26: Lectures on Galatians, 1535, Chapters 1-4 (ed. Jaroslav Jan Pelikan, Hilton C. Oswald, and Helmut T. Lehmann; vol. 26; Saint Louis: Concordia Publishing House, 1999), 26: 32.