According to The ADVENTure of Christmas, legend has it that in the early 1500s Martin Luther was walking through the dark forest one night when he was overwhelmed by the beauty of God's creation. The stars danced like little lights through the trees. He went home, brought a tree in from the forest, put it in his living room and tried to explain the awesomeness to his family but they just weren't getting it (I'm paraphrasing just a bit). He gathered some lit candles and placed them on the tree. I'm assuming his family got it. Isn't it amazing what God uses to remind us of Him?? He made those trees and those stars and He made it mighty pretty!
The heavens declare the glory of God; and the firmament sheweth his handywork.