Holding these views, Mr. Parley Pratt has aimed at embodying, in his introductory key, a general view of what he calls the Science of Theology, "in a concise and somewhat original manner and style, as gathered from revelation, history, prophecy, reason, and analogy." The revelation and prophecy referred to and founded upon are partly those accepted by all orthodox Christians, partly those of recent date (such as the Book of Mormon and the Doctrine and Covenants) peculiar to the followers of Joseph Smith. It is hard to reconcile polygamy with "the progressive principles of the age," and with modern ideas as to the social position and dignity of woman; but Mr. Parley Pratt is not without a scientific plea on behalf of his theological dogma. He maintains that—
This sounds plausible enough in theory, and perhaps the result of polygamy as practised in Utah is, that a large proportion of offspring is born to the most energetic, intelligent, and industrious citizens. In an age when there is reason to fear an increasing tendency to "non-survival of the fittest," such a result may be admitted as tending to counterbalance some of the disadvantages attending plurality of wives.
The highest types of domestic animals have been developed under a system of breeding and selection, very similar to that which is advocated in the above quotations, and the burden of proof seems to rest upon those who maintain that a high type of humanity cannot be developed after a similar fashion. Should the Mormons succeed in carrying out practically, for a few generations, any such ideas as are above alleged to be the main objects contemplated in their law of polygamy, they would have fair grounds for the belief that they are destined to inherit the whole earth.