For it is by grace you have been saved, through faith—and this is not from yourselves, it is the gift of God— not by works, so that no one can boast. For we are God’s handiwork, created in Christ Jesus to do good works, which God prepared in advance for us to do.
Martin Luther may have been the greatest of the Protestant Reformers. A book I would highly recommend is Timothy George’s Theology of the Reformers, in which something of the complexity of that time is presented with a full, succinct look at the theology of Martin Luther, John Calvin, Ulrich Zwingli, and Menno Simons, the last one not really wanting to reform the church, but start over according to the New Testament teaching- but by and by realizing, that you can’t just start from scratch, but must take into account the early centuries of the church when they wrestled through teachings on the Trinity and who Jesus is in his humanity and Deity.
Martin Luther and John Calvin may have been the most gifted of the Reformers, certainly not without their flaws, but it’s a mistake to simply brush them off. They are important church fathers contributing to the church’s understanding and edification in the faith.
Martin Luther himself, and what he accomplished is nothing short of amazing. Of course he would say, and it’s so true that it was not him, but the grace of God in and at work in him. Maybe his greatest contribution was to uncover and unshackle the gospel from the church’s traditions which had all but buried it. And this is not at all to say that all tradition is bad. Every church necessarily so, I think, and in reality has tradition. The question might be whether it’s good, or not, not whether a church should have tradition.
Martin Luther’s insistence from scripture that we are saved by grace alone through Christ alone is at the heart of understanding how the gospel, the good news in Jesus becomes good news for the one who hears or reads of it. God’s grace is a gift, one neither deserved, nor earned, which we receive by simple faith apart from works. Because of Christ’s work for us on the cross in his death, as well as his resurrection and what followed. It is a powerful, living salvation for sure, all in and through Jesus.