For the Christian, October 31st should not simply be a day for costumes and candy. It is the day that we celebrate Reformation Day. The day that Martin Luther nailed the 95 Thesis to the door of the Catholic Church in Wittenberg, Germany. It was that day that Martin Luther decided to take a stand against the heretical teaching of the Catholic Church. The day that Luther wanted to create a rallying cry for people to look at the teachings of the Bible, not just the teachings of men. It was because of that day that many of us stand here today, believing in doctrines like justification by faith alone.
Luther simply was the instigator in the protestant reformation, but he was not alone in his views. One of his contemporaries, John Calvin, also created a buzz around these sort of doctrines. He is unfortunately viewed simply as the man who started "Calvinism," when in reality, he was simply a man who was deeply committed to the preaching and teaching of God's Word.
Over at Desiring God today, John Piper has a great short article and video about Calvin on this great day. Calvin used to say, "After Darkness, Light", a short statement meant to capture what was happening in their day as the glory of the gospel was illuminated in the dark religious world in which they lived.
As you celebrate this day however you are going to do it. Don't forget that much of the truth you claim to believe was defended and championed by a group of men in the early 1500s. It was announced and proclaimed and brought back out of the darkness of their era. And maybe, it needs to be championed again today . . . by YOU!