The influence of mind on matter, and matter on mind, are also so obscure, that it cannot be affirmed that anything which mental operation can effect on one's own body is contrary to natural law. No physiologist will assert that mental resolution, or conviction, tending towards recovery from sickness, is without some power to bring that result to pass. They will admit also that this is peculiarly the case in regard to those disorders which, in pure ignorance of their actual source, they are fain to call hysterical, neuralgic, or generally nervous. They are all acquainted with many cases in their own experience of recovery from such disorders in which no physical cause for recovery can be imagined. If, then, God should convey to the mind of a patient an impression which brings about recovery, there would clearly be no violation of natural law. With regard to the restoration of life, it is quite true that this is beyond the ordinary power of man's volition. Nevertheless, at each moment of our lives there is a communication of life to the dead matter which has formed our food, but which, after digestion, becomes a part of our living organs; and this is true even in the nutrition of plants. How or at what moment the mind enters or becomes capable of affecting our frames, we do not know. But this happens at some moment before or during birth; its doing so at a subsequent period is, therefore, not a breach of natural law, but is only an instance of natural law coming into operation, by the same cause, at a period differing from that which is customary. The _act_, whatever it is, is not exceptional, but ordinary. The _time_ is alone exceptional. We have now to consider the strictly physical phenomena to which the name of miracles is in this discussion confined, and to which the objection that they are contrary to natural laws is commonly stated. A very large number of these are at first glance seen to be only instances of inertia being affected. To walk on water, to make water stand in a heap, to raise a body from the ground, to cast down walls, or move bolts and doors, are obviously exertions of simple mechanical force such as we ourselves daily employ. Their effective cause is neither more nor less than an interference with the law of inertia, and by the previous demonstration they are therefore not to be reckoned as breaches of any law of Nature.