Today is the day we celebrate (or at the very least observe) what people consider the start of the Reformation, when Martin Luther nailed his 95 theses to the door of Wittenburg Chapel. This was pretty much how people made "blog posts" back then. If they wanted something to be read, understood and acted on, they'd write them down and post them somewhere relatively public.

Martin Luther, was great man, but did have his flaws and missteps. He was a rough German man, with legendary flatulence, and a gruff lawyer, not known to be all that gentle. Not everything borne out of the Reformation was immediately positive either. But with his re-discovery of justification by grace through faith, and his own love of God's Law, he set the stage for a massive public reawakening of the Gospel of Jesus Christ. It's the good news that even though we are enemies of God and have willfully cut ourselves off from him, God himself did everything necessary to remove that hostility between us and him. The life, death and resurrection of Jesus, and becoming joined to Him in faith is all that God requires so that we can be fully accepted by him. Our good works may be necessary, but they don't determine our fates.

So ultimately, a celebration of the Reformation is a celebration of our Lord Jesus.