Contrast these two statements on proper disposition. One is from the Vatican, the next post is quotes from the USCCB.
In her loving and pastoral solicitude the Church has made sure that the faithful receive Holy Communion having the right interior dispositions, among which dispositions stands out the need for the Faithful to comprehend and consider interiorly the Real Presence of Him Whom they are to receive. (See The Catechism of Pope Pius X, nn. 628 & 636). The Western Church has established kneeling as one of the signs of devotion appropriate to communicants. A celebrated saying of Saint Augustine, cited by Pope Benedict XVI in n. 66 of his Encyclical Sacramentum Caritatis, (“Sacrament of Love”), teaches: “No one eats that flesh without first adoring it; we should sin were we not to adore it” (Enarrationes in Psalmos 98, 9). Kneeling indicates and promotes the adoration necessary before receiving the Eucharistic Christ.
“Saint Thomas Aquinas also refers to the practice of receiving Holy Communion only on the tongue. He affirms that touching the Body of the Lord is proper only to the ordained priest.
Therefore, for various reasons, among which the Angelic Doctor cites respect for the Sacrament, he writes: “. . . out of reverence towards this Sacrament, nothing touches it, but what is consecrated; hence the corporal and the chalice are consecrated, and likewise the priest’s hands, for touching this Sacrament. Hence, it is not lawful for anyone else to touch it except from necessity, for instance, if it were to fall upon the ground, or else in some other case of urgency” (Summa Theologiae, III, 82, 3).”
In continuity with the teaching of his Predecessor, starting with the Solemnity of Corpus Christi in the year 2008, the Holy Father, Benedict XVI, began to distribute to the faithful the Body of the Lord, by placing it directly on the tongue of the faithful as they remain kneeling.