Men are apt to turn aside somewhat impatiently from an argument about the Nature and Existence of the Deity, because they consider that the question is a metaphysical one which leads nowhere; a problem the resolution of which is beyond our faculties, and the study of which is at once useless and dangerous; they forget that action is ruled by thought, and that our ideas about God are therefore of vast practical importance. On our answer to the question propounded above depends our whole conception of the nature and origin of evil, and of the sanctions of morality; on our idea of God turns our opinion on the much-disputed question of prayer, and, in fact, our whole attitude of mind towards life, here and hereafter. Does morality consist in obedience to the will of a perfectly moral Being, and are we to aim at righteousness of life because in so doing we please God? Or are we to lead noble lives because nobility of life is desirable for itself alone, and because it spreads happiness around us and satisfies the desires of our own nature? Is our mental attitude to be that of kneeling or standing? Are our eyes to be fixed on heaven or on earth? Is prayer to God reasonable and helpful, the natural cry of a child for help from a Father in Heaven? Or is it, on the other hand, a useless appeal to an unknown and irresponsible force? Is the mainspring of our actions to be the idea of duty to God, or a sense of the necessity of bringing our being into harmony with the laws of the universe? It appears to me that these questions are of such grave and vital moment that no apology is needed for drawing attention to them; and because of their importance to mankind I challenge the leaders of the religious and non-religious world alike, the Christians, Theists, Pantheists, and those who take no specific name, duly to test the views they severally hold. In this battle the simple foot soldier may touch with his lance the shield of the knight, and the insignificance of the challenger does not exempt the general from the duty of lifting the gauntlet flung down at his feet. Little care I for personal defeat, if the issue of the conflict should enthrone more firmly the radiant figure of Truth. One fault, however, I am anxious to avoid, and that is the fault of ambiguity. The orthodox and the free-thinking alike do a good deal of useless fighting from sheer misunderstanding of each other's standpoint in the controversy. It appears, then, to be indispensable in the prosecution of the following inquiry that the meaning of the terms used should be unmistakably distinct. I begin, therefore, by defining the technical forms of expression to be employed in my argument; the definitions may be good or bad, that is not material; all that is needed is that the sense in which the various terms are used should be clearly understood. When men fight only for the sake of discovering truth, definiteness of expression is specially incumbent on them; and, as has been eloquently said, "the