16 Be of good courage, O Jerusalem; the Lord will take away all your iniquities. The Lord will wash away the filth of His sons and of His daughters by the Spirit of judgment, and by the Spirit of burning. He will sprinkle clean water upon you, and you shall be cleansed from all your sin. Angels shall dance around you, and say, Who is this that comes up in white array, leaning upon her beloved? For the soul that was formerly a slave has now adopted her Master Himself as her kinsman: and He accepting the unfeigned purpose will answer: Behold, you are fair, my love; behold, you are fair: your teeth are like flocks of sheep new shorn, (because of the confession of a good conscience: and further) which have all of them twins; because of the twofold grace, I mean that which is perfected of water and of the Spirit, or that which is announced by the Old and by the New Testament.
And God grant that all of you when you have finished the course of the fast, may remember what I say, and bringing forth fruit in good works, may stand blameless beside the Spiritual Bridegroom, and obtain the remission of your sins from God; to whom with the Son and Holy Spirit be the glory for ever. Amen.
Source: Catechetical Lectures (New Advent)