In the time of St. Augustine and St. Jerome, there existed among Christians an extraordinary tendency to embrace all possible philosophical doctrines, even when directly opposed to the first principles of revealed religion; and, within the Church, the danger of subtilizing on every question connected with well- known dogmas was much greater than many imagine.
From the previous reflections we may learn how difficult it was to establish, in pagan Europe, a thoroughly Christian life and doctrine; and that, after society had come to be apparently imbued with the new spirit, it was still too easy to disturb the flowing stream of the heavenly graces of the Gospel. This resulted, we repeat, from causes anterior to Christianity, from sources of evil which the divine religion had to overcome, and which too often impeded its supernatural action. In fact, the ecclesiastical history of those ages is comprised mainly in depicting the almost continual deviations from the straight line of pure doctrine and morality, and the strenuous efforts assiduously made by the rulers of the Church against a never- ceasing falling away.
Having taken this glance at the early workings of Christianity through the rest of the world, we may now turn fairly to the immediate subject we have in hand, and trace its course in Ireland. From the very beginning we are struck by the peculiarities—blessed, indeed—which show themselves, as in all other matters, in its reception of the truth. The island, compared with Europe, is small, it is true; but the heroism displayed by its inhabitants during so many ages, in support of the religion which they received so freely, so generously, and at once, in mind as well as heart, marks it out as worthy of a special account; and, from its unique reception and adherence to the faith, as worthy of, if possible, a natural explanation of such action beyond the promptings of Divine grace, since its astonishing perseverance, its unswerving faith, form to-day as great a characteristic of the nation as they did on the day of its entry into the Christian Church.
We proceed to examine, then, the kind of idolatry which its first apostle encountered on landing in the island, and the ease with which it was destroyed, so as to leave behind no poisonous shoots of the deadly root of evil.
In order to understand the religious system of Ireland previous to the preaching of the Gospel, we must first take a general survey of polytheism, if it can be so called, in all Celtic countries, and of the peculiar character which it bore in Ireland itself.
Of old, throughout all countries, religion possessed certain things in common, which belonged to the rites and creeds of all nations, and were evidently derived from the primitive traditions of mankind, and, consequently, from a true and Divine revelation. Such were the belief in a golden age, in the fall from a happy beginning, in the penalty imposed on sin, which gave a reason for great mundane calamities—the Deluge chiefly— the memory of which lived in the traditions of almost every nation; in the necessity of prayer and expiatory sacrifice; in the transmission of guilt from father to son, expressed in all primitive legislations, and to this day preserved in the Chinese laws and customs; in the existence of good and bad spirits, whence, most probably, arose polytheism; in the hope of the future regeneration of man, represented in Greece by the beautiful myth of Pandora's box; and, finally, in the doctrine of eternal rewards and punishments.
Each one of these strictly true dogmas underwent more or less of alteration in its passage through the various nations of antiquity, but was, nevertheless, everywhere preserved in some shape or form.
At what precise epoch did mankind begin wrongfully to interpret these primitive traditions? When did the worship of idols arise and become universal? No one can tell precisely. All we know for certain is, that a thousand years before Christ idolatry prevailed everywhere, and that even the Jewish people often fell into this sin, and were only brought back by means of punishment to the worship of the true God.
But if error tainted the whole system of worship among nations, it differed in the various races of men according to the variety of their character. Ferocity or mildness of manners, acuteness or obtuseness of understanding, activity or indolence of disposition, a burning, a cold, or a temperate climate, a smiling or dreary country, but chiefly the thousand differences of temper which are as marked among mankind as the almost in- finite variety of forms visible in creation, gave to each individual religion its proper and characteristic types, which in after-times, when truth was brought down from heaven for all, imparted to the universal Christian spirit a peculiar outward form in each people, an interior adaptation to its peculiar dispositions, destined in the Divine plan to introduce into the future Catholic Church the beautiful variety requisite to make its very universality possible among mankind.
To enter into details on the Celtic religion would carry us beyond due limits. The question as to whether the ancient Celts were idolaters or not still remains undecided, though in France alone more than six hundred volumes have been written on the subject. Julius Caesar believed that they were worshippers of idols in the same sense as his own countrymen; but he probably stood alone in his opinion. Aristotle, Pythagoras, Polyhistor, Ammianus Marcellinus, considered the Druids as monotheist philosophers. Most of the Greek writers agreed with them, as did all the Alexandrian Fathers of the Church in the third and fourth centuries.