From Dom Guéranger's The Liturgical Year.
It is the feast of the austere reformer of the eleventh century, Peter Damian, the precursor of the holy pontiff Gregory VII., that we are called upon to celebrate to-day. To him is due in part that glorious regeneration, which was effected at that troubled period when judgment had to begin at the house of God. The life he had led under the monastic rule had fitted him for the great contest. So zealously did he withstand the disorders and abuses of his times, that we may attribute to him, at least in great measure, the ardent faith of the two centuries which followed the scandals of the tenth. The Church ranks him among her doctors, on account of his admirable writings: and his penitential life ought to excite us to be fervent in the work we have in hand, the work of our conversion.
The following lessons, read by the Church, on this feast, give us a sketch of our saint’s life:
Petrus, Ravennæ honestis parentibus natus, adhuc lactens a matre numerosæ prolis pertæsa abjicitur, sed domesticæ mulieris opera semivivus exceptus ac recreatus, genitrici ad humanitatis sensum revocata redditur. Utroque orbatus parente, tamquam vile mancipium sub aspera fratria tutela duram servitutem exercuit. Religionis in Deum ac pietatis erga patrem egregium tunc specimen dedit; inventum siquidem forte nummum non propriæ mediæ sublevandæ, sed sacerdoti qui divinum sacrificium ad illius expiationem offerret, erogavit. A Damiano fratre, a quo, uti fertur, cognomentum accepit, benigne receptus, ejus cura litteris eruditur, in quibus brevi tantum profecit, ut magistris admirationi esset. Quum autem liberalibus scientiis floreret et nomine, eas cum laude docuit. Interim ut corpus rationi subderet, sub mollibus vesitibus cilicium adhibuit, jejuniis, vigiliis, et orationibus solerter insistens. Calente juventa, dum carnis stimulis acriter urgeretur, insultan tium libidinum faces rigentibus fluvii mersus aquis noctu extinguebat: tum venerabilia quæque loca obire, tofcumque psalterium recitare consueverat. Ope assidua pauperes levabat, quibus frequenter pastis convivio, propriis ipse manibus ministrabat.
Perficiendæ magis vitæ causa, in Avellanensi Eugubinæ diœcesis cœnobio, Ordini monachorum sanctæ Crucis Fontis Avellanæ, a beato Ludulpho sancti Romualdi discipulo fundato, nomen dedit. Non ita multo post in monasterum Pomposianum, mox in cœnobium Sancti Vincentii Petræ Pertusæ ab abbate suo missus, utrumque asceterium verbo sacro, præclaris institutionibus et moribus excoluit. Ad suos revocatus, post præsidis obitum Avellanitarurm familiæ præficitur, quam novis variis in locis extructis domiciliis, et sanctissimis institutis ita auxit, ut alter ejus Ordinis parens ac præcipuum ornamentum jure sit habitus. Salutarem Petri sollicitudinem alia quoque diversi instituti cœnobia, canonicorum conventus, et populi sunt experti. Urbinati diœcesi non uno nomine profuit: Theuzoni episcopo in causa gravissima assedit, ipsumque in recte administrando episcopatu consilio et opera juvit. Divinorum contemplatione, corporis macerationibus,cæterisque spectatæ sanctimoniæ exemplis excelluit. His motus Stephanus Nonus, Pontifex maximus, eum licet invitum et reluctantem sanctæ Komanæ Ecclesiæ Cardinalem creavit, et Ostiensem episcopum. Quas Petrus dignitates splendidissimis virtutibus, et consentaneis episcopali ministerio operibus gessit.
Difficillimo tempore Romanæ Ecclesiæ summisque Pontificibus doctrina, legationibus, aliisque susceptis laboribus mirifice adfuit. Adversus Nicolaitarum et Simoniacam hæreses ad mortem usque strenue decertavit. Hujusmodi depulsis malia, Mediolanen sem Ecclesiæ Komanæ conciliavit. Benedicto, et Cadaloo, falsis Pontificibus, fortiter restitit. Henricum quartum Germaniæ regem ab iniquo uxoris divortio deterruit: Ravennates ad debita Romano Pontifici obsequia revocatos sacris restituit. Canonicos Veliternos ad sanctioris vitæ leges composuit. In provincia prasertim Urbinate vix ulla fuit episcopalis ecclesia, de qua Petrus non sit bene meritus: Eugubinam, quam aliquan do creditam habuit, multis levavit incommodis: alias alibi, quando oportuit, perinde curavit, ac si suæ essent tutelæcommissæ. Cardinalatu, et episcopali dignitate depositis, nihil de pristina juvandi proximos sedulitate remisit. Jejunium sextæ feriæ in honorem sanctæ crucis Jesu Christi, horarias beatæ Dei Genitricis preces, ejusque die Sabbato cultum propagavit. Inferendæ quoque sibi verberationis morem ad patratorum scelerum expiationem provexit. Demum sanctitate, doctrina, miraeulis, et præclare actis illustris, dum e Ravennate legatione rediret, Faventiæ octavo Kalendas Martii migravit ad Christum. Ejus corpus ibidem apud Cistercienses multis miraculis darum frequenti populorum veneratione colitur. Ipsum Faventini non semel in præsenti discrimine propitium experti, patronum apud Deum delegerunt: Leo vero duodecimus, Pontifex maximus, Officium Missamque in ejus honorem tamquam confessoris pontificis, quæ aliquibus in diœcesibus, atque in Ordine Camaldulensium jam celebrabantur, ex Sacroram Rituum Congregationis consulto, addita doctoria qualitate, ad universam extendit Ecclesiam.
Peter was born at Ravenna, of respectable parents. His mother, wearied with the care of a large family, abandoned him when a babe; but one of her female servants found him in an almost dying state, and took care of him, until such time as the mother, repenting of her unnatural conduct, consented to treat him as her child. After the death of his parents, one of his brothers, a most harsh man, took him as a servant, or more truly as his slave. It was about this period of his life that he performed an action, which evinced his virtue and his filial piety. He happened to find a sum of money: but instead of using it for his own wants, he gave it to a priest, begging him to offer up the holy sacrifice for the repose of his father’s soul. Another of his brothers, called Damian (after whom, it is said, he was named), had him educated; and so rapid and so great was the progress he made in his studies, that he was the admiration of his masters. He became such a proficient in the liberal sciences, that he was made to teach them in the public schools, which he did with great success. During all this time, it was his study to bring his body into subjection to the spirit; and to this end, he wore a hair shirt under an out wardly comfortable dress, and practised frequent fasting, watching, and prayer. Being in the very ardour of youth, and being cruelly buffeted by the sting of the flesh, he, during the night, would go and plunge himself into a frozen pool of water, that he might quench the impure flame which tormented him; or he would make pilgrimages to holy sanctuaries, and recite the entire psalter. His charities to the poor were unceasing, and when he provided them with a meal, which was frequently, he would wait upon them himself.
Out of a desire to lead a still more perfect life, he became a religious in the monastery of Avellino, in the diocese of Gubbio, of the Order of the monks of holy Cross of Fontavellana, which was founded by the blessed Ludolphus, a disciple of St. Romuald. Being sent by his abbot, not very long after, first to the monastery of Pomposia, and then to that of Saint Vincent of PietraPertusa, he edified both houses by his preaching, admirable teaching, and holy life. At the death of the abbot of Avellino, he was recalled to that monastery, and was made its superior. The institute was so benefited by his government, not only by the new monasteries which he founded in several places, but also by the very saintly regulations he drew up, that he was justly looked upon as the second founder of the Order, and its brightest ornament. Houses of other Orders, canons, yea, entire congregations of the faithful, were benefited by Peter’s enlightened zeal. He was a benefactor, in more ways than one, to the diocese of Urbino: he aided the bishop Theuzo in a most important suit, and assisted him, both by advice and work, in the right administration of his diocese. His spirit of holy contemplation, his corporal austerities, and the saintly tenor of his whole conduct, gained for him so high a reputation, that Pope Stephen IX., in spite of Peter's extreme reluctance, created him Cardinal of the holy Roman Church and bishop of Ostia. The saint proved himself worthy of these honours by the exercise of the most eminent virtues, and by the faithful discharge of his episcopal office.
It would be impossible to describe the services he rendered to the Church and the sovereign Pontiffs, during those most trying times, by his learning, his prudence as legate, and his untiring zeal. His life was one continued struggle against simony, and the heresy of the Nicolaites. He purged the Church of Milan of these disorders, and brought her into subjection to the Holy See. He courageously resisted the anti-popes Benedict and Cadalous. He deterred Henry IV., king of Germany, from an unjust divorce of his wife. He restored the people of Ravenna to their allegiance to the Roman Pontiff, and absolved them from interdict. He reformed the abuses which had crept in among the canons of Vellotri. There was scarcely a single cathedral church in the province of Urbino that had not experienced the beneficial effects of Peter’s holy zeal: thus, that of Gubbio, which was for some time under his care, was relieved by him of many evils; and other churches, that needed his help, found him as earnest for their welfare as though he were their own bishop. When he obtained permission to resign his dignity as Cardinal and his bishopric, he relented nothing of his former charity, but was equally ready in doing good to all. He was instrumental in propagating many devout practices; among these may be mentioned, fasting on Fridays in honour of the holy cross; the reciting the Little Office of our Lady; the keeping the Saturday as a day especially devoted to Mary; the taking of the discipline in expiation of past Bins. At length, after a life which had edified the world by holiness, learning, miracles, and glorious works, on his return from Ravenna, whither he had been sent as legate, he slept in Christ, on the eighth of the Calends of March (February 23), at Faënza. His relics, which are kept in the Cistercian church of that town, are devoutly honoured by the faithful, and many miracles are wrought at the holy shrine. The inhabitants of Faënza have chosen him as the patron of their city, having several times experienced his protection when threatened by danger. His Mass and Office, which were kept under the rite of confessor and bishop, had been long observed in several dioceses, and by the Camaldolese Order; but they were extended to the whole Church by a decree of the Congregation of Sacred Rites, which was approved by Pope Leo XII., who also added to the name of the saint the title of Doctor.
Thy soul was inflamed by the zeal of God’s house, O Peter! God gave thee to His Church in those sad times when the wickedness of the world had robbed her of well-nigh all her beauty. Thou hadst the spirit of an Elias within thee, and it gave thee courage to waken the servants of the Lord: they had slept, and while they were asleep, the enemy came, and the field was oversown with tares. Then did better days dawn for the bride of Christ; the promises made by our Lord were fulfilled; but who was the friend of the bridegroom? Who was the chief instrument used by God to bring back to His house its ancient beauty? A saint who bore the glorious name of Peter Damian! In those days, the sanctuary was degraded by secular interference. The princes of the earth said: 'Let us possess the sanctuary of God for an inheritance.’ The Church, which God intended to be free, was but a slave, in the power of the rulers of this world; and the vices, which are inherent to human weakness, defiled the temple. But God had pity on the bride of Christ, and for her deliverance He would use human agency: He chose thee, Peter, as His principal co-operator in restoring order. Thy example and thy labours prepared the way for Gregory, the faithful and dauntless Hildebrand, into whose hands the keys were no sooner placed, than the work of regeneration was completed. Thou hast fought the good fight; thou art now in thy rest; but thy love of the Church, and thy power to help, are greater than ever. Watch, then, over her interests. Obtain for her pastors that apostolic energy and courage, which alone can cope with enemies so determined as hers are. Obtain for her priests the holiness which God demands from them that are the salt of the earth. Obtain for the faithful the respect and obedience they owe to those who direct them in the path of salvation. Thou wast not only the apostle, thou wast moreover the model, of penance in the midst of a corrupt age; pray for us, that we may be eager to atone for our sins by works of mortification. Excite within our souls the remembrance of the sufferings of our Redeemer, that so His Passion may urge us to repentance and hope. Increase our confidence in Mary, the refuge of sinners, and make us, like thyself, full of filial affection towards her, and of zeal that she may be honoured and loved by those who are around us.
 1 St. Peter iv. 17.
 St. Matt. xiii. 25.
 St. John iii. 29.
 Ps. lxxxii. 13.
 St. Matt. v. 13.