Not less vain is the hope of those who would find in the laws of science a permanent abiding place--perhaps one should say was rather than is, for the avowed gospel of science which was to usurp the office of olden-time religious faith is already like the precedent historic sense, itself becoming a thing of the past. Yet the much discussed war between science and religion is none the less real because to-day the din of battle has ceased. It does not depend on criticism of the Mosaic story of creation by the one, nor on hostility to progress offered by the other. These things were only signs of a deeper and more radical difference: religion is the voice of faith uttering in symbols of the imagination its distrust of the world as a scene of deception and unreality, whereas science is the attempt to discover fixed laws in the midst of this very world of change. If to-day the strife between the two seems reconciled, this only means that faith has grown dimmer and that science has learned the futility of its more dogmatic assumptions.[10] The very growth of science is in fact a gradual recognition of motion as the basis of phenomena and an increasing comprehension of what may be called the laws of motion. When motion was regarded as simple and regular, it seemed possible to explain phenomena by correspondingly simple and regular laws; but when each primary motion was seen to be the resultant of an infinite series of motions the question became in like manner infinitely complex, or in other words insoluble. But to be clear we must consider the matter more in detail. From the days of the old Greek Heraclitus, who built up his theory of the world on the axiom of eternal flux and change, the Doctrine of Motion as a distinct enunciation has lingered on in the world well-nigh unnoticed and buried from sight in the bulk of suppositions and guesses that have made up the passing systems of philosophy. Now and then some lonely thinker took up the doctrine, but only to let it drop back into obscurity; until during the great burst of scientific enquiry in the fifteenth and sixteenth centuries it assumed new significance and began to grow. From that time to this its progress in acceptance as the basis of phenomena may be regarded as a measure of scientific advance.