And if this is true in regard to so-called physical science, it is _a fortiori_ true as regards the Science of Spirit. There is a mechanical attitude of mind which judges everything by the limitations of past experiences, allowing nothing for the fact that those experiences were for the most part the results of our ignorance of spiritual law. But if we realise the true law of Being we shall rise above these mechanical conceptions. We shall not deny the reality of the body or of the physical world as facts, knowing that they also are Spirit, but we shall learn to deny their power as causes. We shall learn to distinguish between the _causa causta_ and the _causa causans_, the secondary or apparent physical cause and the primary or spiritual cause, without which the secondary cause could not exist; and so we shall get a new standpoint of clear knowledge and certain power by stepping over the threshold of the mechanical and entering into the spirit of it. What we have to do is to maintain our even balance between the two extremes, denying neither Spirit nor the mechanism which is its form and through which it works. The one is as necessary to a perfect whole as the other, for there must be an _outside_ as well as an _inside_; only we must remember that the creative principle is always _inside_, and that the outside only exhibits what the inside creates. Hence, whatever external effect we would produce, we must first enter into the spirit of it and work upon the spiritual principle, whether in ourselves or others; and by so doing our insight will become greatly enlarged, for from without we can see only one small portion of the circumference, while from the centre we can see the whole of it. If we fully grasp the truth that Spirit is Creator, we can dispense with painful investigations into the mechanical side of all our problems. If we are constructing from without, then we have to calculate anxiously the strength of our materials and the force of every thrust and strain to which they may be subjected, and very possibly after all we may find that we have made a mistake somewhere in our elaborate calculations. But if we realise the power of creating from within, we shall find all these calculations correctly made for us; for the same Spirit which is Creator is also that which the Bible calls "the Wonderful Numberer." Construction from without is based upon analysis, and no analysis is complete without accurate quantitative knowledge; but creation is the very opposite of analysis, and carries its own mathematics with it.