14 “You gave Me no kiss, but she from the time she came in has not ceased to kiss My feet.” A kiss is the sign of love. Whence, then, can a Jew have a kiss, seeing he has not known peace, nor received peace from Christ when He said: “My peace I give you, My peace I leave you.” The Synagogue has not a kiss, but the Church has, who waited for Him, who loved Him, who said: “Let Him kiss me with the kisses of His mouth.” For by His kisses she wished gradually to quench the burning of that long desire, which had grown with looking for the coming of the Lord, and to satisfy her thirst by this gift. And so the holy prophet says: “You shall open my mouth, and it shall declare Your praise.” He, then, who praises the Lord Jesus kisses Him, he who praises Him undoubtedly believes. Finally, David himself says: “I believed, therefore have I spoken;” and before: “Let my mouth be filled with Your praise, and let me sing of Your glory.”
Source: Letters (New Advent)