They brought before the minds of churchmen a thousand new questions which must be solved, unless the Church was to relinquish for ever her claims as the great teacher and satisfier of the human soul.

To study these bubbles, as they formed and burst on every wave of human life; to feel, too often by sad experience, as Augustine felt, the charm of their allurements; to divide the truths at which they aimed from the falsehood which they offered as its substitute; to exhibit the Catholic Church as possessing, in the great facts which she proclaimed, full satisfaction, even for the most subtle metaphysical cravings of a diseased age;--that was the work of the time; and men were sent to do it, and aided in their labour by the very causes which had produced the intellectual revolution.

The general intermixture of ideas, creeds, and races, even the mere physical facilities for intercourse between different parts of the Empire, helped to give the great Christian fathers of the fourth and fifth centuries a breadth of observation, a depth of thought, a large-hearted and large-minded patience and tolerance, such as, we may say boldly, the Church has since beheld but rarely, and the world never; at least, if we are to judge those great men by what they had, and not by what they had not, and to believe, as we are bound, that had they lived now, and not then, they would have towered as far above the heads of this generation as they did above the heads of their own.

And thus an age, which, to the shallow insight of a sneerer like Gibbon, seems only a rotting and aimless chaos of sensuality and anarchy, fanaticism and hypocrisy, produced a Clement and an Athanase, a Chrysostom and an Augustine; absorbed into the sphere of Christianity all which was most valuable in the philosophies of Greece and Egypt, and in the social organisation of Rome, as an heirloom for nations yet unborn; and laid in foreign lands, by unconscious agents, the foundations of all European thought and Ethics.
But the health of a Church depends, not merely on the creed which it professes, not even on the wisdom and holiness of a few great ecclesiastics, but on the faith and virtue of its individual members.
The _mens sana_ must have a _corpus sanum_ to inhabit.

And even for the Western Church, the lofty future which was in store for it would have been impossible, without some infusion of new and healthier blood into the veins of a world drained and tainted by the influence of Rome.
And the new blood, at the era of this story, was at hand.