Religious poetry comprised lyric fragments, which were introduced into the lives of the saints and there formed a kind of Christian saga, or else were based on Holy Writ, like the Lamentation of Eve; hymns in honor of the saints, like The Hymn to St. Michael, by Mael Isu; pieces such as the famous Hymn of St. Patrick; and philosophic poems like that keen analysis of the flight of thought which dates from the tenth century.
At a time when the poets of other lands seem wholly engrossed in the recital of the deeds of men, one of the great and constant distinguishing marks of poetry in Ireland, whether we have to do with a short note set down by a scribe on the margin of a manuscript or with a religious or profane poem, is a deep, personal, and intimate love of nature expressed not by detailed description, but more often by a single picturesque and telling epithet. Thus we have the hermit who prays God to give him a hut in a lonely place beside a clear spring in the wood, with a little lark to sing overhead; or we have Marban, who, rich in nuts, crab-apples, sloes, watercress, and honey, refuses to go back to the court to which the king, his brother, presses him to return. Now, we have the description of the summer scene, in which the blackbird sings and the sun smiles; now, the song of the sea and of the wind, which blows tempestuously from the four quarters of the sky; again, the winter song, when the snow covers the hills, when every furrow is a streamlet and the wolves range restlessly abroad, while the birds, numbed to the heart, are silent; or yet again the recluse in his cell, humorously comparing his quest of ideas to the pursuit of the mice by his pet cat. This deep love of inanimate and animate things becomes individualized in those poems in which every tree, every spring, every bird is described with its own special features.
If we remember that these original poems, which, before the twelfth century, expressed thoughts that were scarcely known to the literature of Europe before the eighteenth, are, besides, clothed in the rich garb of a subtle harmony, what admiration, what respect, and what love ought we not to show to that ancient Ireland which, in the darkest ages of western civilization, not only became the depositary of Latin knowledge and spread it over the continent, but also had been able to create for herself new artistic and poetic forms!