We Catholics do not quarrel with the methods of the religious historian, so long as he keeps within his proper limits, within the limits of historical data and proved historical fact, and so long as he does not claim in his classification of religious types to pass decisive judgment upon the essential nature of the religious structure which he has under examination. We Catholics acknowledge readily, without any shame, nay with pride, that Catholicism cannot be identified simply and wholly with primitive Christianity, nor even with the Gospel of Christ, in the same way that the great oak cannot be identified with the tiny acorn. There is no mechanical identity, but an organic identity. And we go further and say that thousands of years hence Catholicism will probably be even richer, more luxuriant, more manifold in dogma, morals, law and worship than the Catholicism of the present day. A religious historian of the fifth millennium A.D. will without difficulty discover in Catholicism conceptions and forms and practices which derive from India, China and Japan, and he will have to recognize a far more obvious complex of opposites.” It is quite true, Catholicism is a union of contraries. But contraries are not contradictories. Wherever there is life, there you must have conflict and contrary. Even in purely biblical Christianity, and especially in Old Testament religion, these conflicts and contraries may be observed. For only so is there growth and the continual emergence of new forms. The Gospel of Christ would have been no living gospel, and the seed which He scattered no living seed, if it had remained ever the tiny seed of A.D. 33, and had not struck root, and had not assimilated foreign matter, and had not by the help of this foreign matter grown up into a tree, so that the birds of the air dwell in its branches. So we are far from begrudging the religious historian the pleasure of reading off the inner growth of Catholicism by means of the annual rings of its trunk, and of specifying all those elements which its living force has appropriated from foreign sources. But we refuse to see in these elements thus enumerated the essence of Catholicism, or even to grant that they are “structural elements of Catholicism” in the sense that Catholicism did not achieve historical importance save through them. For the Catholic is intimately conscious that Catholicism is ever the same, yesterday and to-day, that its essential nature was already present and manifest when it began its journey through the world, that Christ Himself breathed into it the breath of life, and that He Himself at the same time gave the young organism those germinal aptitudes which have unfolded themselves in the course of the centuries in regular adaptation to the needs and requirements of its environment. Catholicism recognizes in itself no element that is inwardly foreign to it, that is not itself, that does not derive from its original nature.