When you ask me for the evidence of this purpose, I point to the fact that the phenomenal causes, as you denominate the mere physical agencies employed in the production of certain objects, were incapable of any volitional action, and that without volition the connection between the physical agencies and their effects could not have been established. The stone and the chisel were the immediate physical agencies which produced the obelisk. But who selected the stone and wielded the chisel? And who designed the moral uses of the obelisk? Procreation, by the sexual union, is the immediate physical cause of the existence of an individual animal. But who designed its structure, appointed for it a law of its being, and established the physical agencies which brought the individual into existence and the moral consequences that those agencies produce? KOSMICOS. We are no nearer to an agreement than we have been in our former discussions. And the reason is that you do not perceive the mission and the method of science. Science undertakes to discover those causes of phenomena which can be verified by experience; so that we can truly say that our knowledge has been advanced, and that we really do know something of the things which we talk about. This is the domain of science. Its conclusions do not extend into the region of that which is unknown and unknowable. Inasmuch as its conclusions are strictly positive, because they are demonstrated by experience, they negative, as matter of knowledge, anything beyond. You may speculate about what lies beyond, but you have no reason for saying that you know anything about it; whereas men who reason as you do, and yet who do not accept dogmas simply as matters of faith, are constantly trying to persuade themselves that they know something about that of which they have no means of knowledge. If you accept that something as a matter of faith, because you are satisfied with the evidence which establishes, or is supposed to establish, a divine revelation, you have a ground for belief with which science does not undertake to interfere. But you have no ground for maintaining that, from the phenomena of nature alone, you can derive any knowledge beyond that which you can demonstrate as a scientific fact.