You have asked me to retrace before you one of those pages of religious history which places the thoughts which I come to express in their fullest aspect. The origins of Christianity form the most heroic episode in the history of humanity. Man never drew from his heart more devotion, more love of the ideal, than in the one hundred and fifty years which elapsed from the sweet Galilean vision, under Tiberius, to the death of Marcus Aurelius. The religious consciousness was never more eminently creative, and never laid down with more authority the law of the future. This extraordinary movement, to which no other can be compared, came forth from the bosom of Judaism. But it is doubtful if Judaism alone would have conquered the world. It was necessary that a young and bold school, coming out of its midst, should take the audacious part of renouncing the largest portion of the Mosaic ritual. It was necessary, above all, that the new movement should be transported into the midst of the Greeks and Latins, while awaiting the Barbarians, and become like yeast in the bosom of those European races by which humanity accomplishes its destinies. What a beautiful subject he will discourse upon who shall one day explain to you the part which Greece took in that great common work! You have commissioned me to show to you the part of Rome. The action of Rome is the first in date. It was scarcely until the beginning of the third century that the Greek genius, with Clement of Alexandria and Origen, really seized upon Christianity. I hope to show you, that, since the second century, Rome has exercised a decisive influence upon the Church of Jesus.