The Beauty and Spirituality of the Traditional Latin Mass-- by David Joyce, Latin Mass Society of England and Wales

"...when the faithful themselves receive Communion, they receive It kneeling at the altar rail, and directly onto their tongue. This is very significant. Receiving Communion whilst kneeling means that the faithful line up in a row before the sanctuary, and thus have time to prepare themselves for this most sacred of events: coming into spiritual and substantial union with Christ Himself. The communicant kneels down, and whilst he waits for the priest to make his way around, he can settle himself, concentrate on the upcoming Communion with our Lord praying intensely. When it is his turn, the priest says the prayer: "May the body of Our Lord Jesus Christ keep your soul until life everlasting. Amen". This means, besides the beauty and the significance of the words themselves, that the priest says the word "Amen" so that the communicant need not invoke his voice to receive the King of Kings, allowing a constant stream of prayer and thanksgiving to flow from soul to Savior. The communicant simply needs to expose his tongue, and his side of the proceedings is complete. Upon receiving Christ, he can continue praying for a little while, and only then does he need to return to his seat, leaving room for the next communicant. Moreover, having the priest come over to the communicant signifies that Christ comes to us, feeds us with His own divine life, whilst we wait kneeling and unmoving like little children totally dependent on His love, mercy and compassion. This is the message of the Gospel: to become like little children, submitting our wills to His and depending totally on Him for everything. We cannot even feed ourselves without Christ's help, and the action of Communion in the traditional manner demonstrates this in a very vivid manner.