By prescinding from theism I do not mean to exclude or deny it; for it is, as I have just said, bound up with the same conception from which the "argument from adaptability" is drawn. I only mean that I do not need to build upon it as on a prior conception; that I can put it aside. Indeed, of these two off-shoots, theism is less near to the common root, as will appear later. Our limited mind cannot take in at once all the consequences or presuppositions of a thought; for this would be to know everything; but as with our outward eye we take in the circle of the horizon bit by bit, so with our mind when we turn to one aspect of an idea we lose sight of another. Hence in studying some complex organism or mechanism I may be clear about the bearing of any part on its immediately neighbouring parts, and yet may have no present notion of the whole; or may prescind entirely from the question of its origin or its purpose. Thus our thoughts are always unfinished and frayed round the edges, and we do not know how much they involve and drag along with them. We can think of the mechanism, and the organism, and the design, without thinking of the mechanist, or the organizer, or the designer; and so in all cases where two ideas are connected without being actually correlative. What is commonly called a philosophical proof consists simply in showing us the implications of some part of the general conception of things that we already hold. It is to force us either to loosen our hold on that part or else to admit all that it entails by way of consequences or presuppositions; and so to bring our thoughts into consistency one way or the other. But until something sets our mind in motion it can rest very comfortably in partial conceptions, without following them out to their results. Now as we can understand a mechanism to the extent of seeing the bearing of part upon part, and even of all the parts upon the work it does, without going on to think about the designer or his design; and without explicitly considering it as designed; so we can and do think of the world and recognize order in it, and see the bearing of part upon part without going back to God or forward to God's purposes. Indeed, so far as we use the argument from design to prove the existence of God, it means that we first apprehend this order and regular sequence of events, and then, as a second and distinct step, put it down to design. For although God is the prior cause of design and of all creation, yet design and creation is the prior cause of our knowing God, The conception of a rational and moral world leads us to the conception of a rational and moral origin, i.e., to theism. Further, it is plain that this same order and regularity is recognized by many who refuse to see design in it, and who invent other hypotheses to account for it; and of one of these hypotheses we shall presently speak at length.