When the Church celebrates the liturgy of Advent each year, she makes present this ancient expectancy of the Messiah, for by sharing in the long preparation for the Savior's first coming, the faithful renew their ardent desire for his second coming. By celebrating the precursor's birth and martyrdom, the Church unites herself to his desire: "He must increase, but I must decrease."
Let's not let the season pass without a depth of spirituality in our hearts that lets us ponder. Ponder the mystery of how, and why, this Omnipotent God, before Whom angels tremble, would come down and live nine months in the most pure and holy woman that ever lived, and ever will live. He was confined in a womb with that Infinite Intelligence, Infinite Power, and the Power of the Holy Spirit.
source: EWTN