It it truly meet and just, right and for our salvation, that we should at all times, and in all places, give thanks unto Thee, O holy Lord, Father almighty, everlasting God; Who didst establish the salvation of mankind on the tree of the Cross; that whence death came, thence also life might arise again, and that he, who overcame by the tree, by the tree also might be overcome: Through Christ our Lord. Through whom the Angels praise Thy Majesty, the Dominations worship it, the Powers stand in awe. The Heavens and the heavenly hosts together with the blessed Seraphim in triumphant chorus unite to celebrate it. Together with these we entreat Thee that Thou mayest bid our voices also to be admitted while we say with lowly praise. (Preface of the Holy Cross for Passion Sunday)
Coepiscopi means fellow bishops. The phrase is taken from St.Augustine's address to his "fellow bishops," the familial men of his diocese of Hippo. St. Augustine said to his Coepiscopi: "Each and every one of you have in the home the bishop's office to see to it that neither his wife nor his son nor his daughter nor even his servant fall away from the truth. For they were bought with a great price."