The following sample of quotes are taken from: Martin Luther's Commentary on the Epistle to the Galatians (Kindle Edition).
"By His resurrection Christ won the victory over law, sin, flesh, world, devil, death, hell, and every evil. And this His victory He donated unto us. These many tyrants and enemies of ours may accuse and frighten us, but they dare not condemn us, for Christ, whom God the Father has raised from the dead is our righteousness and our victory."
"We find no rest for our weary bones unless we cling to the word of grace."
"True Christian theology does not inquire into the nature of God, but into God's purpose and will in Christ, whom God incorporated in our flesh to live and to die for our sins. There is nothing more dangerous than to speculate about the incomprehensible power, wisdom, and majesty of God when the conscience is in turmoil over sin. To do so is to lose God altogether because God becomes intolerable when we seek to measure and to comprehend His infinite majesty."
"To bestow peace and grace lies in the province of God, who alone can create these blessings. The angels cannot. The apostles could only distribute these blessings by the preaching of the Gospel. In attributing to Christ the divine power of creating and giving grace, peace, everlasting life, righteousness, and forgiveness of sins, the conclusion is inevitable that Christ is truly God."
"For if our sins could be removed by our own efforts, what need was there for the Son of God to be given for them? Since Christ was given for our sins it stands to reason that they cannot be put away by our own efforts."
"The vicious character of sin is brought out by the words "who gave himself for our sins." So vicious is sin that only the sacrifice of Christ could atone for sin."
"The genius of Christianity takes the words of Paul "who gave himself for our sins" as true and efficacious. We are not to look upon our sins as insignificant trifles. On the other hand, we are not to regard them as so terrible that we must despair. Learn to believe that Christ was given, not for picayune and imaginary transgressions, but for mountainous sins; not for one or two, but for all; not for sins that can be discarded, but for sins that are stubbornly ingrained. Practice this knowledge and fortify yourself against despair, particularly in the last hour, when the memory of past sins assails the conscience."
"The article of justification is fragile. Not in itself, of course, but in us. I know how quickly a person can forfeit the joy of the Gospel. I know in what slippery places even those stand who seem to have a good footing in the matters of faith. In the midst of the conflict when we should be consoling ourselves with the Gospel, the Law rears up and begins to rage all over our conscience. I say the Gospel is frail because we are frail."
"Therefore we teach that to know Christ and to believe in Him is no achievement of man, but the gift of God. God alone can create and preserve faith in us. God creates faith in us through the Word. He increases, strengthens and confirms faith in us through His word. Hence the best service that anybody can render God is diligently to hear and read God's Word."
"When I first took over the defense of the Gospel, I remembered what Doctor Staupitz said to me. "I like it well," he said, "that the doctrine which you proclaim gives glory to God alone and none to man. For never can too much glory, goodness, and mercy be ascribed unto God." These words of the worthy Doctor comforted and confirmed me. The Gospel is true because it deprives men of all glory, wisdom, and righteousness and turns over all honor to the Creator alone. It is safer to attribute too much glory unto God than unto man."
"True faith lays hold of Christ and leans on Him alone."
"On the question of justification we must remain adamant, or else we shall lose the truth of the Gospel. It is a matter of life and death. It involves the death of the Son of God, who died for the sins of the world. If we surrender faith in Christ, as the only thing that can justify us, the death and resurrection of Jesus are without meaning; that Christ is the Savior of the world would be a myth. God would be a liar, because He would not have fulfilled His promises."
"The true way of salvation is this. First, a person must realize that he is a sinner, the kind of a sinner who is congenitally unable to do any good thing. "Whatsoever is not of faith, is sin." Those who seek to earn the grace of God by their own efforts are trying to please God with sins. They mock God, and provoke His anger. The first step on the way to salvation is to repent. The second part is this. God sent His only-begotten Son into the world that we may live through His merit. He was crucified and killed for us. By sacrificing His Son for us God revealed Himself to us as a merciful Father who donates remission of sins, righteousness, and life everlasting for Christ's sake. God hands out His gifts freely unto all men. That is the praise and glory of His mercy."