Neither the natural history nor the physiology of man, nor both together, are competent to give a complete account of his marvellous and many-sided being. Yet some thinkers appear to imagine that when a place has been assigned him in the animal kingdom, and his close relationship to forms below him in the scale of life has been demonstrated; when every tissue and structure has been analysed, and every organ described and its function ascertained; then the last word has been spoken, and the subject exhausted. Those unique and distinguishing faculties by which all this amazing work of observation, comparison, reasoning, has been accomplished, appear either to be left out of the account altogether, or to be handled with a meagre inadequacy of treatment that contrasts in the strongest manner with the fulness and the elaboration which mark the other discussion. And the more this physical aspect of our composite nature is emphasized; the more urgently it is insisted that, somehow or other, all that is in man and all that comes of man may be explained on the assumption that he is the natural climax of the animal creation, a kind of educated and glorified brute--that and nothing more;--the harder it becomes to give any rational account of those facts of his nature which are commonly recognised as spiritual, and among them of this instinct of prayer and its Object. Under these discouraging circumstances, men are fatally prone to seek escape from their self-involved dilemma, by a hardy denial of what their methods have failed to discover and their favourite theories to explain. The soul and God are treated as mere metaphysical expressions, or as popular designations of the unknown causes of phenomena; and prayer is declared to be an act of foolish superstition which persons of culture have long since outgrown. Sad and strange this result is; but it is also the natural outcome of an initial error, which is none the less real because unperceived. Men "seek the living among the dead"; they expect to find the soul by _post mortem_ examination, or to see God by help of an improved telescope. They fail and are disappointed, though they have little right to be so, for "spiritual things are discerned spiritually," and not otherwise.