III. On the Epiphany, Whitsun (Pentecost) Day especially.
O Lord, fountain of goodness, Father unbegotten, from whom all good things come, have mercy on us.
O Lord, you sent your Son to suffer for the sins of the world that he might save it, have mercy on us.
O Lord, you bestow the sevenfold gifts of the Spirit, by whom heaven and earth are filled, have mercy on us.
O Christ, the only-begotten of God the Father, whom the holy prophets wondrously foretold to be born into the world of a virgin, have mercy on us.
O holy Christ, Lord of heaven, theme of glorious song, before whom the highest angels ever stand, chanting the praise of your divinity, have mercy on us.
O Christ, from heaven accept our prayers. We devoutly and humbly worship you on earth, calling to you, gentle Jesus, have mercy on us.
O Lord, gracious Spirit, in union with the Father and the Son, consisting of one nature, proceeding from both, have mercy on us.
O Lord, who appeared in the form of a dove when Christ was baptized in the water of Jordan, have mercy on us.
O Lord, fire divine, kindle our hearts that we may proclaim you, have mercy on us.
Source: The Sarum Missal in English, Part II, Alcuin Club Collections, No. XI
A Collection of Prayers 