Ask the unbeliever, the materialist, what this vital principle is, and he answers: "It is the all-pervading force that is modified by the organic structure." That is, in his philosophy, the "vital force is produced by the organism," and the "organism is produced by the vital principle?" So, being at the last limit of the physical analysis of the organic being, he is involved in a contradiction, while the Christian who believes in a spiritual substance refers all to spirit, and claims a continuation of his identity as an intelligent spirit, resting in his ultimate or starting point, viz: God. Do you say I am lost in God? Well, to be thus lost in God is to be saved from corruption and from the dust of the grave; but to be lost in the dust of the grave and in the ceaseless changes of matter is to be lost to God and to spiritual being. Let me be with God rather than lost amid the dark waves of oblivion. Has science no prerogatives above the physical? Tread lightly here; you might step on holy ground. Do you use the old cry that all outside of matter belongs to the "unknown" and "unknowable?" Exchange the terms for the terms the "uncomprehended" and the "incomprehensible," and we will walk side by side. We know many things which we do not comprehend. Do we comprehend all that belongs to the physical sciences? Do we comprehend matter? I know that I know, but do I comprehend that knowledge? If I should say I know the unknowable, I am guilty of a contradiction in language. Do you say matter is infinite? Can I comprehended the infinite? If science be that certain knowledge which is the equivalent of comprehension, then one of two things is true: First, there is no such thing as physical science; or, secondly, I may have certain knowledge of the infinite--may comprehend the infinite. How is this? Where is the difficulty? It is here: the knowledge which constitutes science is not necessarily that knowledge which is the equivalent of the comprehension of the thing known. Hence the incomprehensible is not to be excluded from the field of scientific investigation. If matter be infinite, and if it belongs to the field of scientific knowledge, then the infinite and incomprehensible belong, also, to the domain of scientific investigation. If the infinite can not be comprehended, matter can not be comprehended, and if all that can not be comprehended should be dismissed from scientific investigation, then matter should be dismissed.