St. Francis of Assisi tells us: “Every day Jesus humbles himself just as he did when he came from his heavenly throne into the Virgin’s womb; every day he comes to us.” Therefore, we cannot receive him if not in a state of deep humility and repentance. Again, St. Francis says, “If it is right to honor the Blessed Virgin Mary because she bore him in her holy womb; if John the Baptist trembled and was afraid even to touch Christ’s sacred head; if the tomb where he lay for only a short time is so venerated; how holy, and virtuous, and worthy should not the one who receives him into his heart and mouth…Surely this is a great pity, a pitiable weakness, to have him present with you like this and be distracted by anything else in the whole world. Our whole being should be seized with fear, the whole world should tremble and heaven rejoice, when Christ the Son of the living God is present on the altar in the hands of the priest.”
Card R Cantalamessa: The Eucharist Our Sanctification, Liturgical Press; p. 33-34