The first widespread usage of the greeting "Merry Christmas" apparently began in 1843 with the publishing of Charles Dickens' A Christmas Carol. Not surprisingly, the greeting first appeared on Christmas cards that same year. The idea behind this phrase is that Christmas should be a happy, joyous time. So when you wish someone a "Merry Christmas," you are, in fact, offering a blessing to them for a merry or happy occasion. For Christians, this is where it gets interesting. The annual celebration of Christ's birth is not directly commanded in Scripture. However, there is a compelling reason to celebrate the Advent.
Do not miss this!
There is no activity that is more appropriate than engaging in the praise of Christ and his earthly mission which began with his advent. Why? Because this praise dominates heaven. So, celebrating the birth of Christ really is a wonderfully appropriate activity. This is what led to the praise of the angels in Luke. In Luke 2 the sky erupts with the praise of angels:
"Suddenly a great company of the heavenly host appeared with the angel, praising God and saying, 'Glory to God in the highest heaven, and on earth peace to those on whom his favor rests.'"
[Read the rest of the article at Shepherd Press.]