The Kiss of Peace

Osculum Pacis

When we have ceased from prayer, we salute one another with a kiss.  There is then brought to the President, bread and a cup of wine

Justin Martyr (100 - 165 AD)

Then the Deacon cries aloud, "Receive ye one another; and let us kiss one another." Think not that this kiss is of the same character with those given in public by common friends. It is not such: but this kiss blends souls one with another, and courts entire forgiveness for them. The kiss therefore is the sign that our souls are mingled together, and banish all remembrance of wrongs. For this cause Christ said, If thou art offering thy gift at the altar, and there rememberest that thy brother hath aught against time, leave there thy gift upon the altar, and go thy way; first be reconciled to thy brother, and then come and offer thy gift. The kiss therefore is reconciliation, and for this reason holy: as the blessed Paul somewhere cried, saying, Greet ye one another with a holy kiss; and Peter, with a kiss of charity.

St Cyril of Jerusalem (315 -386 AD)

therefore the kiss, or rather the salutation, should be given with the utmost care, since if there be mixed with it the least defilement of thought, it excludes us from eternal life

Athenagoras (2nd Century AD)

What prayer is complete from which the holy kiss is divorced? What kind of sacrifice is that from which men depart without the peace?

Tertullian (160 - 230 AD)

But there are those, that do nothing but make the churches resound with a kiss, not having love itself within.

For this very thing, the shameless use of a kiss, which ought to be mystic, occasions foul suspicions and evil reports. The apostle calls the kiss holy.  .....  For if it is proper mystically "in the closet" to pray to God, it will follow that we are also to greet mystically our neighbour, whom we are commanded to love second similarly to God, within doors, "redeeming the time." "For we are the salt of the earth."

Clement of Alexandria (150 - 220 AD)

Finally, brethren, farewell. Be perfect, be of good comfort, be of one mind, live in peace; and the God of love and peace shall be with you.
Greet one another with an holy kiss.
All the saints salute you.
The grace of the Lord Jesus Christ, and the love of God, and the communion of the Holy Ghost, be with you all. Amen.

St Paul 2 Corinthians 13:11 - 14

Ver. 12. "Salute one another with a holy kiss."

What is "holy?" not hollow, not treacherous, like the kiss which Judas gave to Christ. For therefore is the kiss given, that it may be fuel unto love, that it may kindle the disposition, that we may so love each other, as brothers brothers, as children parents, as parents children; yea, rather even far more. For those things are a disposition implanted by nature, but these by spiritual grace. Thus our souls bound unto each other. And therefore when we return after an absence we kiss each other, our souls hastening unto mutual intercourse. For this is that member which most of all declares to us the workings of the soul. But about this holy kiss somewhat else may yet be said.

To what effect? We are the temple of Christ; we kiss then the porch and entrance of the temple when we kiss each other. See ye not how many kiss even the porch of this temple, some stooping clown, others grasping it with their hand, and putting their hand to their mouth. And through these gates and doors Christ both had entered into us, and doth enter, whensoever we communicate. Ye who partake of the mysteries understand what I say. For it is in no common manner that our lips are honored, when they receive the Lord's Body. It is for this reason chiefly that we here kiss. Let them give ear who speak filthy things, who utter railing, and let them shudder to think what that mouth is they dishonor; let those give ear who kiss obscenely. Hear what things God hath proclaimed by thy mouth, and keep it undefiled. He hath discoursed of the life to come, of the resurrection, of immortality, that death is not death, of those other innumerable mysteries. For he that is about to be initiated comes to the priest's mouth as it were an oracle, to hear things full of awe. For he lost his life even from his forefathers, and comes to seek it again, and to ask how he may haply find and get it back. Then God announceth to him how it may be found, and that mouth becomes more awful than the very mercy-seat. For that mercy-seat never sent forth a voice like this, but spake much of lesser things, of wars and such peace as is here below: but this speaks all about heaven and the life to come, and things new and that pass understanding. And having said,

Ver. 13. "Salute one another with an holy kiss," he added, "All the saints salute you."
By this also giving them good hopes. He has added this in the place of the kiss, knitting them together by the salutation, for the words also proceed from the same mouth from which the kiss. Seest thou how he brings them all together, both those who are widely separated in the body and those who are near, these by the kiss and those by the written message?

Ver. 14. "The grace of our Lord Jesus Christ, and the love of God," and the Father, "and the communion of the Holy Ghost, be with you all." After having united them to one other by the salutations and the kisses, he again closes his speech with prayer, with much carefulness uniting them unto God also.

St Augustine (354 - 430 AD)