From Dom Gueranger’s The Liturgical Year:
He will be. born, then, with more beauty and lustre and might than you have hitherto seen in Him, O ye faithful ones, who hold Him within you as your only treasure, and who have long lived no other life than His, shaping your thoughts and works on the model of His. You will feel the necessity of words to suit and express your love; such words as He delights to hear you speak to Him. You will find them in the holy liturgy.
You, who have had Him within you without knowing Him, and have possessed Him without relishing the sweetness of His presence, open your hearts to welcome Him, this time, with more care and love. He repeats His visit of this year with an untiring tenderness; He has forgotten your past slights; He would ‘that all things be new.’ [Apoc. xxi. 5]. Make room for the divine Infant, for He desires to grow within your soul. The time of His coming is close at hand: let your heart, then, be on the watch; and lest you should slumber when He arrives, watch and pray, yea, sing. The words of the liturgy are intended also for your use: they speak of darkness, which only God can enlighten; of wounds, which only His mercy can heal; of a faintness, which can be braced only by His divine energy.