While Christmas cards often focus on themes of peace, joy, and celebration, the season of Advent calls us to remember a different message - one of repentance, judgment, and preparation. As the document explains, there can be no Christmas without first experiencing Advent; we cannot receive God's mercy and blessings without confessing our sins. The author suggests that during this time we should reflect seriously on how sin affects our lives and world, and take steps to reform ourselves and make positive changes, so that on Christmas our hearts will be purified and ready to welcome Christ.