44 In the Oriental Church, too, most illustrious Fathers bear witness to the excellence of Catholic celibacy. In this matter as in others there was harmony between the Latin and Oriental Churches where accurate discipline flourished. St. Epiphanius at the end of the fourth century tells us that celibacy applied even to the subdiaconate: "The Church does not on any account admit a man living in the wedded state and having children, even though he have only one wife, to the orders of deacon, priest, bishop or subdeacon; but only him whose wife be dead or who should abstain from the use of marriage; this is done in those places especially where the ecclesiastical canons are accurately followed." The Deacon of Edessa and Doctor of the Universal Church, well called the Harp of the Holy Spirit, St. Ephraem, the Syrian, is particularly eloquent on this matter. In one of his poems, addressed to his friend, the bishop Abraham, he says: "Thou art true to thy name, Abraham, for thou also art the father of many: but because thou hast no wife as Abraham had Sara, behold thy flock is thy spouse. Bring up its children in thy truth; may they become to thee children of the spirit and sons of the promise that makes them heirs to Eden. O sweet fruit of chastity, in which the priesthood finds its delights . . . the horn of plenty flowed over and anointed thee, a hand rested on thee and chose thee out, the Church desired thee and held thee dear." And in another place: "It is not enough for the priest and the name of the priesthood, it is not enough, I say, for him who offers up the living body, to cleanse his soul and tongue and hand and make spotless his whole body; but he must at all times be absolutely and preeminently pure, because he is established as a mediator between God and the human race. May He be praised who made His servants clean!" St. John Chrysostom affirms: "The priest must be so pure that, if he were to be lifted up and placed in the heavens themselves, he might take a place in the midst of the Angels."
Source: Ad Catholici Sacerdotii (Vatican.va)