Such being the relation which subsists between the theory of Materialism, and some of the most important doctrines of Natural and Revealed Religion, it is not wonderful that a serious consideration of the latter should lead reflective men to abjure the former, or that their aversion to it should increase in proportion as their views of Divine truth are extended and enlarged. Not a few have yielded, in early youth, to the charm of speculative inquiry, and fondly embraced the idea of "unisubstancisme," who have lived to exchange it for a more Scriptural faith. For just in proportion as men are brought under the influence of serious views of God, of the soul, and of an eternal world, in the same proportion will they become alienated, and even averse, from a theory which confounds "spirit" with "matter," obscures their conceptions of God and of the world of spirits, and degrades men to the level of the beasts that perish. This effect of new, or, at least, more vivid views of "things unseen and eternal" was instructively exemplified in the case of the late Robert Hall. Like many an ardent speculatist, he had embraced in early life the system of Materialism; and even after he had entered on the work of the ministry, he could write to a professedly Christian congregation in the following terms: "I am, and have been for a long time, a Materialist, though I have never drawn your attention to this subject in my preaching, because I have always considered it myself, and wished you to consider it, as a _mere metaphysical speculation_. My opinion, however, on this head, is, that the nature of man is simple and uniform, that the thinking powers and faculties are the result of a certain organization of matter,--and that after death he ceases to be conscious until the resurrection."[180] But speculative inquiry was soon to give place to spiritual faith. The death of his revered and pious father brought his mind into realizing contact with an unseen and eternal world; and, in the words of his biographer, distinguished alike for profound science and deep practical piety, "The death of Mr. Hall's father tended greatly to bring his mind to the state of serious thought with which he entered on the pastoral office. Meditating with the deepest veneration upon the unusual excellences of a parent now forever lost to him, he was led to investigate, with renewed earnestness, the truth as well as the value of those high and sacred principles from which his eminent piety and admirable consistency so evidently flowed. He called to mind, too, several occasions on which his father, partly by the force of reason, partly by that of tender expostulation, had exhorted him to abandon the vague and dangerous speculations to which he was prone. Some important changes in Mr. Hall's sentiments resulted from an inquiry conducted under such solemn impressions, and among these may be mentioned his renunciation of Materialism, which, he often declared, he _buried in his father's grave_."