As we learned Sunday during Pastor Toms message at Thorn Creek Reformed Church, Post tenebras lux is a Latin phrase. It is translated as Light After Darkness. The phrase came to be adopted by John Calvin, and was subsequently adopted as the motto of the entire Protestant Reformation. It is used by John Calvins adopted city of Geneva, Switzerland on their coins. As a mark of its role in the Calvinist movement, the motto is engraved on the Reformation Wall, in Geneva, and the Huguenot Monument, in Franschhoek, South Africa.
Since Halloween and Reformation Day happened on the same day, it was even more unlikely that little Dutch kids would be going trick or treating on October 31.
At the risk of sounding picky, the real reformation is simply a return to the light delivered by Paul regarding the Gospel of Jesus Christ. Perhaps, "Return to light after a time of darkness" would have been a more apt slogan. It seems we "reformed" are routinely accused (around FR) of commencing with a message from the 16th cent. onward, when in fact we were simply denouncing a departure commencing circa 150AD.