Advantages that the Establishment of Christianity has conferred upon the Human Race (Miscell., vol. ii, p. 90), "there had been in the Christian idea the mysterious self-sowing quality so constantly claimed for it, how came it that in the Eastern part of the Empire it was as powerless for spiritual or moral regeneration as it was for political health and vitality; while in the Western part it became the organ of the most important of all the past transformations of the civilized world? Is not the difference to be explained by the difference in the surrounding medium, and what is the effect of such an explanation upon the supernatural claims of the Christian idea?" Its inclusion as one of other modes, varying only in degree, by which man has progressed from the "ape and tiger" stage to the highest ideals of the race, makes clear what concerns us here, namely, its attitude toward secular knowledge, and the consequent serious arrest of that knowledge. That a religion which its followers claim to be of supernatural origin, and secured from error by the perpetual guidance of a Holy Spirit, should have opposed inquiry into matters the faculty for investigating which lay within human power and province; that it should actually have put to death those who dared thus to inquire, and to make known what they had discovered; is a problem which its advocates may settle among themselves. It is no problem to those who take the opposite view. In outlining the history of Christianity stress will be here laid only upon those elements which caused it to be an arresting force in man's intellectual development, and, therefore, in his spiritual emancipation from terrors begotten of ignorance. It does not fall within our survey to speak of that primary element in it which was before all dogma, and which may survive when dogma has become only a matter of antiquarian interest. That element, born of emotion, which, as a crowd of kindred examples show, incarnates, and then deifies the object of its worship, was the belief in the manifestation of the divine through the human Jesus who had borne men's griefs, carried their sorrows, and offered rest to the weary and heavy-laden. For no religion--and here Evolution comes in as witness--can take root which does not adapt itself to, and answer some need of, the heart of man. Hence the importance of study of the history of all religions.