Third eldest of five children born to Patrick Sheehan, owner of a small business, and to Joanna Regan, he was baptised by The Very Reverend Dr. John McCarthy, the sponsors being Timothy Cronin and Mary Ann Relehan.
He was described as "a bit of a dreamer, and when other lads were shouting at play, he went alone to some copse or thicket, and with a book, or more often without one, would sit and think, and look dreamily at floating clouds or running stream; and then, with a sigh go back to his desk".
When Sheehan and his brother Denis (1854–1941), who subsequently joined the Civil Service, had been despatched to secondary school, his sisters entered the Convent of Mercy in Mallow.
He completed secondary education in St Colman's College, Fermoy, at a time which coincided with the Fenian Rising, the events of which were to have a profound effect on him.
He returned to the theme of violent insurrection in several of his novels, most notably The Graves at Kilmorna, recounting Fenian incidents witnessed by him while a student in Fermoy.
Rentless logic, with its formidable chevaux-de-frise of syllogisms, propositions, scholia; Metaphysics, sublime, but hardened into slabs of theories, congealed in medieval Latin; Physics, embracing a course that would have appalled a young Newton or Kepler; and then the vast shadow of four years' Divinity towering above and over-shadowing all!".
O'Rourke, the Professor of French and English, whom Sheehan describes as a "very gentle, polished man", was obliged to leave the college and go abroad for health reasons.
In 1881 he was transferred to Cobh (then Queenstown) and subsequently back to Mallow where he remained until Bishop Robert Browne nominated him Parish Priest of Doneraile on 4 July 1895.
The same meetings also resulted in a long series of social improvements in the town of Doneraile which saw the installation of a modern water supply system and the building of an advanced electrification plant.
The Parish Priest of Doneraile was frequently asked to assist tenants in their approaches to the local land agents to agree terms for the purchase of their holdings.
I rather thought that his silent, reserved manner would have kept people in awe of him, yet when he died, all the older generation had instances to relate of his unostentatious kindness, especially to the poor and sick".
Sheehan's literary career modestly began in 1881 with a series of essays published in The Irish Ecclesiastical Record on subjects ranging from religious instruction in intermediate schools to the effects of emigration on the Church; from the philosophy of Ralph Waldo Emerson to the political significance of Léon Gambetta in post-war France; from liberal thought in the United States to a theological critique of a current of patristic thinking in England and in the United States that saw St Augustine of Hippo as the Martin Luther of his age.
Several pamphlets would be written by him for the Catholic Truth Society on subjects such as Thoughts on the Immaculate Conception, The Canticle of the Magnificat, and Our Personal and Social Responsibilities.
He attracted much attention in Ireland, England, on the continent as well as in the United States through his observations in literary and religious magazines on issues related to clerical life, education and philosophy.
Several of his books were translated and published in German, French, Irish, Hungarian, Polish, Czech, Slovenian, Spanish, Ukrainian, Dutch, Flemish and Italian.
[3] Sheehan is best remembered as a novelist; in his novel My New Curate, he recounts an incident of a clerical appointment that may well be autobiographical and refer to his arrival in Doneraile: "The Bishop sent for me and said, with what I would call a tone of pity or contempt, but he was incapable of either, for he was the essence of charity and sincerity: 'Father Dan, you are a bit of a literateur, I understand.
[6] The success of land purchase in Cork was much to the frustration of John Redmond's Irish Party (IPP) who believed that a national Home Rule movement could not survive without social grievances and without the antagonism of Catholic and Protestant.
Its principles of establishing a movement of a new kind to attract rather than repel Unionist and Protestant support for an All-Ireland Home Rule settlement, while influentially limited, did motivate a worthy political initiative.
His nationalism was neither exclusively Gaelic nor Catholic and best portrayed by him in his novel The Intellectuals (1911), whose archetypical characters of man and women of Catholic and Protestant background from Ireland, England and Scotland, meet to discuss current issues of the day, Sheehan in the preface saying "that his object was to show that there really was no invincible antagonism amongst the people who make up the commonwealth of Ireland that may not be removed by a freer and kindlier intercourse with each other".
[10] In a letter to the Jesuit Father Herman Heuser, Sheehan's American biographer, Holmes explained: "I was at Doneraile and called every day after luncheon, that time being the best for him.
[11] Sheehan was diagnosed with a fatal illness in 1910 but refused to undergo surgery, carrying out his parish duties until he died of cancer on the evening of Rosary Sunday, 5 October 1913.
[12] In the context of its Corpus of Electronic Texts (CELT), University College Cork has begun a digitisation project to make Sheehan's extensive literary oeuvre available on line.