Can you just give me the condensed version?
...Aware of the greatness of the moment of Holy Communion, the Church in her two-millennium-long tradition has searched to find a ritual expression that can bear witness in the most perfect manner to her faith, love and respect. This is verified when, in the wake of an organic development, stemming from at least the sixth century, the Church began to adopt the method of distributing the Sacred Species of the Eucharist directly into the mouth. This is attested to in several places: in the biography of Pope Gregory the Great and an indication by the same Pope relative to Pope Agapitus (Dialogues, III); the Synod of Cordoba in 839 condemned the sect of so-called “Casiani” because of their refusal to receive Holy Communion directly into their mouths; then the Synod of Rouen in 878 confirmed the norm in force regarding the administration of the Lord’s Body on the tongue, threatening sacred ministers with suspension from their office if they distributed Holy Communion to the laity on the hand.
In the West, the gesture of prostration and genuflection before reception of the Body of the Lord is found in monastic settings already from the sixth century, e.g., in the monasteries of St. Columbanus. Later, in the tenth and eleventh centuries, this gesture was even more widely diffused. At the end of the patristic age, the practice of receiving Holy Communion directly into the mouth became thenceforth an almost universal practice.
This organic development may be considered a fruit of the spirituality and Eucharistic devotion of the Fathers of the Church. Already in the first millennium, due to the highly sacred character of the Eucharistic Bread, the Church in both the East and the West in an admirable consensus and almost instinctively perceived the urgency of distributing Holy Communion to the laity only in the mouth. The liturgist Joseph Jungmann explains that, with Communion distributed directly into the mouth, various concerns are eliminated: the need for the faithful to have clean hands; the even graver concern that no fragment of the consecrated Bread be lost; the necessity of purifying the palm of the hand after reception of the Sacrament. The white tablecloth and, later, the Communion plate would be the expression of heightened attention to the Sacrament of the Eucharist....
The Fathers of the Church demonstrate a lively concern that no one lose the smallest particle of Eucharistic Bread, as exhorted St. Cyril of Jerusalem in this very impressive manner:
Be careful that you do not lose anything of the Body of the Lord. If you let fall anything, you must think of it as though you cut off one of the members of your own body. Tell me, I beg you, if someone gave you kernels of gold, would you not guard them with the greatest care and diligence, intent on not losing anything? Should you not exercise even greater care and vigilance, so that not even a crumb of the Lord’s Body could fall to the ground, for It is far more precious than gold or jewels? (Mystagogical Catecheses, 5, 2)...Based on the experience of the first centuries, in the organic growth in theological comprehension of the Eucharistic mystery and its consequent ritual development, the manner of distributing Communion on the hand was limited by the end of the patristic era to a specific group, that is, the clergy, as is still the case with the Eastern rites. The Eucharistic Bread began to be distributed to the laity – intincted in the consecrated Wine in the Eastern rites – directly into the mouth. In the Eastern rites, only the non-consecrated bread is distributed on the hand, the so-called antidoron. Thus is shown in a clear manner the difference between Eucharistic Bread and bread that is merely blessed. The most frequent admonition of the Fathers of the Church about the attitude to possess during Holy Communion resounded thus: cum amore ac timore (with love and fear). The authentic spirit of Eucharistic devotion of the Church Fathers developed organically at the end of antiquity in the whole Church – East and West – in the corresponding ways of receiving Holy Communion in the mouth, preceded by prostration on the ground (in the East) or with kneeling (in the West). Would it not correspond much better to the intimate reality and truth of the consecrated Bread, if today also the faithful one in receiving It prostrated on the ground and opened his mouth as the Prophet received the Word of God (cf. Ezekiel 2) and let himself be fed like a child – since Communion is a spiritual nourishment? Such a gesture would likewise be an impressive sign of the profession of faith in the Real Presence of God in the midst of the faithful. If some non-believer happened upon the liturgical action and observed such an act of adoration, perhaps he too, “falling on his face, will worship God and declare that God is really among you” (1 Cor 14:25).