Learned men, in the study and appreciation of the material world, separate sciences absolutely, and, considering each apart from its practical application, occupy themselves in their scientific investigations only with the pure theory. This I understand and admit; for such a course does not endanger the security of society or the results of their own labours. {194} Their ignorance and their errors have no doubt grave inconveniences; the facts and the forces of the material world are either misconceived or not turned sufficiently to account; man and human society do not reap all the advantages which the profound and exact knowledge of the truth might, in this respect, procure them. Such ill, although real, is of a negative description, a good, it may be, missed or postponed; but no general disturbance results in that material world upon which naturalists or chemists concentrate their labours; the world will not have to undergo the effect, nor to pay the penalty, of their ignorance or of their errors. The intellectual and moral world, on the contrary, runs a greater risk, and imposes upon its teachers severer duties; no doubt these study it as freely, and make truth, too, their object; but science does not here escape the weight of its own conclusions; it is a power as formidable in its abuse as it is in itself sublime; it may carry into the world to which it addresses itself trouble instead of order, incendiarism instead of light. If practical application is not here the object of science, it is still its necessary and appropriate proof; in facts as in a mirror are reflected the truth or the error, the good or the ill, of human opinions. {195} Christianity has now been subjected to this test for nineteen centuries: it is subject to it at this moment, it will continue ever to be so. I need not say that I do not propose to retrace here the narrative of the manner in which it has supported and surmounted that test; that would be to write the History of Christianity. I confine myself, on the contrary, to a single small part of this history, the most modest part, the least pretending: and shall endeavour to bare a little to the view what Christianity, when it has been put into practice, what Christian Faith, after it has become Christian Life, has in the different situations of man's life accomplished, and is every day accomplishing, for the ennoblement of his nature, and the furtherance of his ultimate destiny. {196}