If, then, the student of the science of religion directs his attention primarily to the discovery of resemblances between religions which at first sight bear no more resemblance to one another than Greek did to the Celtic tongues; if the comparative method of science dwells upon the fact that things which differ from one another may also resemble one another, and that their resemblances may be stated in the form of scientific laws,--there is still another aspect of the truth, and it is that between things which resemble one another there are also differences. And the jury of the world will ultimately demand to know the truth and the whole truth.
Now, to get not only at the truth, but at the whole of the truth, is precisely the business of the applied science of religion, and is the very object of that which, in order to distinguish it from the comparative method of science, I have called the method of comparison. For the purposes of fair comparison not only must the resemblances, which the { 22} comparative method of science dwells on, be taken into account, but the differences, also, must be weighed. And it is the business of the method of comparison, the object of the applied science of religion, to do both things. Neither of the two can be dispensed with; neither is more important than the other; but for the practical purposes of the missionary it is important to begin with the resemblances; and on grounds of logic and of theory, the resemblances must be first established, if the importance, nay! the decisive value, of the differences is to go home to the hearts and minds of the missionary's hearers. The resemblances are there and are to be studied ultimately in order to bring out the differences and make them stand forth so plainly as to make choice between the higher form of religion and the lower easy, simply because the difference is so manifest. Now, the missionary's hearer could not know, much less appreciate, the difference, the superiority of Christianity, as long as Christianity was unknown to him. And it is equally manifest, though it has never been officially recognised until now and by the Hartford Theological Seminary, that neither can the missionary adequately set forth the superiority of Christianity to { 23} the lower forms of religion, unless he knows something about them and about the points in which their inferiority consists. Hitherto he has had to learn that for himself, as he went on, and, as it were, by rule of thumb. But, on business principles, economy of labour and efficiency in work will be better secured if he is taught before he goes out, and is taught on scientific methods. What he has to learn is the resemblances between the various forms of religion, the differences between them, and the relative values of those differences.