The exulting members of Christ sing this Psalm (Ps 123). And who here below exults except in hope? If this our hope is sure, then we too can sing with exultation. For those who are singing are not foreign to us; its not as if in this Psalm we do not hear our own voice. Listen to it in such a way that you can hear yourselves; listen to it as if you were looking at yourselves in the mirror of the Scriptures. When you look at the Scriptures as if at a mirror, your face brightens: when in the exultation of your hope you find yourself like those members of Christ who sang these things, you too will be among these members and you will sing these things. [Augustine, Enar. in Ps 123,3; PL 37:1641]