"It often required an express command of his superiors to take him from his books that his body might not succumb, and the mind gain the necessary rest. So exact was he in all his ways, that we, his fellow students, could, at any hour of the day, point out the very spot where he might be found, either going through the Way of the Cross, or praying before the Blessed Sacrament, or reciting his rosary, or studying at his books. Is it a wonder, then, that God should allow him to die on a spot which had so often been the witness of so much piety and so many of his good works."
He was ordained priest in 1880, and the following February found him at the Boston Highlands in the Church of Our Lady of Perpetual Help. Here he administered for the first time the Sacrament of Penance; here he preached from the pulpit of his panegyrist his first sermon; here he entered upon "that career of zeal and usefulness which made his name proverbial in every family of the parish." ... "He possessed a powerful and comprehensive mind, a prodigious memory, and a most fertile imagination; and, above all, a most generous spirit and tender heart. Graced besides with every form of manly beauty, strength and vigor, of a powerful frame, nothing seemed wanting to him. It might be said of him as the poet sang of the ancient hero:
"'He was a combination and a form indeed,
Where God did seem to set his very seal,
To give the world the picture of a man.'"
Father Licking dwelt at length upon the great extent of the work done in the parish by the beloved deceased. "Every interest in the large parish received his particular attention." All were participants of his zeal and charity. In 1883 he passed through his second novitiate after a retirement of six months, which fully equipped him for the missions. "And now his soul rejoiced, indeed, in the Lord."
"It is related," said the preacher, "of a Southern officer, that when he returned from a successful expedition, the first question he put to his general always was: 'Where is the next blow to be struck? Send me there!' So it was with the young warrior of the Cross, whose death we mourn. His zeal knew no bounds except those of obedience. Hardly had one mission been finished when he hastened to another.... North, South, East and West were witnesses of his Apostolic zeal and saintly fervor. The cold weather, the fierce storms, and still fiercer spirits of hostile sects in Newfoundland, had not terrors enough to deter him, and the hottest sun of July and August could not draw from him a single word of complaint, when engaged in arduous task of giving retreats. And though comparatively a young man, when only four years had elapsed since his ordination, his superiors trusting in his zeal, his prudence, and his wisdom, selected him, from out of many, to the important office of giving retreats to the clergy of the land." ... "I see among the floral tributes one bearing the letters 'Apostolic Zeal.' It shows me that you have understood his spirit."
In the panegyrist's recital it was told that six weeks before his death he was returning from missions in Pennsylvania. He saw in New York the very Rev. Provincial, who told him that the Fathers at work on the missions at Philadelphia were becoming exhausted, and that even then the Rev. Father McGivern was on a dying bed there. Father O'Brien stood up, and stretching himself to the full height of his massive frame, he exclaimed, "Look at me! Am I not a strong man? Send me. I'll do the work for them!" "Does it not remind you of the brave general who said, 'Where is the next blow to be struck. Send me there.'" When that, his last mission, closed, the Fathers had heard thirty-five hundred confessions, and he retired to Ilchester for a cursory visit, where the joy he experienced in meeting his old Alma Mater superiors was beyond description. While there he remarked: "Father, this would be a nice, quiet and holy place to die in." That night he was attacked with the fatal malady. His limbs became racked with pain. The rheumatism reached his great heart, and he is found at five o'clock in the morning insensible. The last sacraments were administered, and at seven o'clock his noble soul took its flight from its mortal abode.
With an eloquent peroration, Rev. Father Licking closed by craving the prayers of the faithful for the departed hero of the Cross.
The pathetic musical services were rendered by the regular choir of the church, and comprised the Gregorian Requiem Mass, Miss Nellie M. McGowan, organist. The twelve pall-bearers were Colonel P. T. Hanley, Frank Ford, John J. Kennedy, M. H. Farrell, Thomas Kelly, E. J. Lynch, James McCormack, Thomas O'Leary, James B. Hand, William S. McGowan, John Reardon and Timothy McCarthy. Mount Calvary Cemetery was the place selected for the interment. In His Grace Archbishop Williams' vault the body will repose until the completion of work now in progress on a lot specially intended for Father O'Brien. It is estimated that the services at the church were attended by over twenty-five hundred people, and the funeral was likewise largely attended. Every kind attention was paid to his bereaved mother, father, and sister, who came on here from New York State.