But it is clear that the miracles recorded in the New Testament, if caused by material forces at all, could not have been due to their ordinary action. They must have been due either to an unknown combination of known forces, or to the calling of unknown forces into activity, or to the immediate agency of the divine mind. It is clear therefore that their occurrence as objective facts proves the presence of mind acting in some way on the material forces of nature. To determine the mode in which this action mast have taken place has nothing to do with the question of miracles, or the reality of their occurrence. A miracle therefore may, for all practical purposes of this argument, be defined as an occurrence which cannot be effectuated by the ordinary action of the known material forces of the Universe, and could only have been brought about by the agency of intelligent volition; and which is preceded by an announcement on the part of the agent that it is about to happen or takes place directly on his bidding. The latter element, as I have observed, is essential to constitute the occurrence an evidential miracle. Otherwise in our ignorance of what unknown forces may exist in the universe, we could have no certainty that the event was not a mere unusual occurrence effected by some already existing but unknown forces. To the highest form of the miracles in the New Testament, however, such an idea would be inapplicable. It may perhaps here be objected that in laying down this definition of a miracle, I have not sufficiently identified its performance with the governing power of the universe, _i.e._ God; but that if supernatural agents exist, inferior to God, it may be due to their operation; and consequently that it may not be evidential of a divine commission. This objection will be fully considered in a subsequent portion of this work.