Christmas is Christ's coming in the next few weeks in a new, powerful, and much needed way. Christmas is not just a remembrance; it is a present reality. Therefore, Christmas will soon be either one of the best things that has ever happened to us or a sadly missed opportunity.
When Christ comes this Christmastime, He will provide for us richly. Jesus will "destroy the veil" which keeps us in the dark, free us from the web "woven over all nations," "destroy death forever," "wipe away the tears from all faces," and remove our reproach (Is 25:6-8). The Lord will apply His salvation to the practical details of our lives (Is 25:9). This Christmas, Jesus will especially cure "cripples, the deformed, the blind, the mute, and many others besides" (Mt 15:30). The Lord will take our inadequacies and miraculously multiply our very little to provide for the very many (see Mt 15:32ff).
Because Christmas is Christ coming in such power and glory, we are not ready to receive Him. Therefore, we must prepare to believe and receive Him more deeply by our repentance, discipline, penance, service, and evangelization during the Advent season. Because Christmas is so great, Advent is so needed. Prepare the way of the Lord (Lk 3:4).